1). If you go to the drug store, ______me a toothpaste.

          a). Buying                 b). Will buy            c). Would buy                   d). Buy

2). Ann might phone this evening. I don't want to go out ____ she phones.

          a). If                         b). In case               c). Unless               d). As long as

3). ______you ______ at home last night, you _______ a temperature now.

          a). Had _ stayed / wouldn't have             b). Had _ stayed/ would not have had

          c). Did _  stay / wouldn't have                 d). Did_ stay / wouldn't have stayed

4). _______fire, please leave the building as quickly as possible.

          a). Without               b). If not                 ). In case                 ). In case of

5). If I _______ to bed late last night, I _______sleepy now.

          a). Hadn't gone / wouldn't get                 b). Had gone / wouldn't have got

          c). Didn't go / wouldn't get                     d). Didn't go / wouldn't have got

6). If you ____ you didn't like riding a camel, I ________a trip to the desert.

          a). Know / won't suggest                        b). Knew / wouldn't suggest

          c). Had known / wouldn't have suggested d). Had known / wouldn't suggest

7). Without electricity, modern life ______

          a). Wouldn't have existed      b). Wouldn't exist  c). Didn't exist                   d). Doesn't exist

8). But for your help yesterday, I _________the report.

          a). Wouldn't have finished     b). Didn't finish     c). Hadn't finished   d). Don't finish

9). Why isn't Jane in class today? _ I don't know. I'm sure she ______ unless she ____a good reason.

          a). Wouldn't be / had                              b). Will not be / has

          c). Wouldn't have been / had had             d). Weren't / had

10). It's a good thing we took a map with us. If we________ it, we ________lost.

          a). Don't take / will get                           b). Didn't take / would get

          c). Hadn't taken/ would have got             d). Hadn't taken/ had got

11). How did you get to work this morning? _ I drove. I _______  a bus but I overslept.

          a). Would have taken          b). Had taken c). Would take                   d). Took

12). ______I in your shoes, I _______ such rude words to her.

          a). Were/ wouldn't say                           b). Should be/ won't say

          c). Be/ will not say                                 d). Had been/ wouldn't have said

13). You ____ to wear a mask and a cloak if you ____in Beijing now_ the radio says there's a lot of sandstorms now.

          a). Will need / are                                  b). Would need / were

          c). Would have needed / had been           d). Would need / are

14). Without gravity, we _________anything.

          a). Won't weigh       b). Don't  weigh       c). Couldn't have weighed  d). Couldn't weigh

15). At the desert, if night ________, the temperatures _______ to below 0 C

          a). Came/ would fall                              b). Comes / will fall

          c). Had come / would have fallen            d). Come / fall

16). ______he here, I should ask him.

          a). If were            b). Had been                c). Would be           d). Were

17). Providing she ________ hard, she will pass the exam.

          a). Study             b). Will study               c). Would study                 d). Studies

18). If John _____ the race last week, he _______ the happiest man in the ceremony today.

          a). Won / would be                                b). Had won / would be

          c). Won / would have been                     d). Had won / would have been

19). Are you coming to the party? _ I don't think so, but If I change my mind, I ____ you.

          a). Had told        b). Will tell                   c). Would have told d). Would tell

20). You should tell the police if your bicycle ______ .

          a). Was stolen    b). Is stolen                   c). Were stolen                  d). Would be stolen

21). Supposing  the boat capsized, what ______you______?

          a). Do_ do        b). Will_ do                    c). Did _ do             d). Would_ do

22). Traveling by car is convenient _______you have somewhere to park.

          a). Provided that          b). Unless            c). Supposing          d). In case

23). _______you _______any help, come to see me.

          a). Should / need          b). Did/need        c). Had/ needed                 d). Would / need

24). What ______  doing right now if you _______ in class.

          a). Would be/ weren't   b). Were / weren't c). Will be / aren't    d). Would have been / had been

25). ______I ______, he would have married me.

          a). Did _ agree              b). Would _ agree          c). Had _ agreed      d). Should_ agree

26). I’m not tired . If I ______ tired, I _____ home now.        

          a) am / will go              b) were / would go         c) were / will be       d) had been tired / would go

27). I wish you ________something instead of just sitting and doing nothing.

          a) will do                     b) did                   c) would do             d)had done

28). I wish I _________something to read.

          a) have                        b) had                   c) would have                   d) had had

29). I wish she ________me the truth last night

          a). told                         b). has told           c). had told              d). would tell

30). Unless you understand, I ________it to you again.

          a). will explain           b). would explain   c). explained           d). had explained

31). If  you _________ a student at NQ High School next year, you ………….to wear a uniform.

          a). are / will have       b). were / would have       c). are / have           d). were / had had

32). _______ ill, she could have finished the report.    

          a). If she                     b). she had             c). had she              d). If had

33). Without computers, we ________  the information so quickly.

          a). can’t find              b). couldn’t find     c). won’t find          d). wouldn’t have found

34). __________he apologizes to the teacher, she will be very angry.

          a). If                          b). Unless               c). Providing           d). In case

35). Her father is on business today. If he ________at home today, he _______her to the cinema.

          a). is / will take         b). were / would take         c). be / will take                 d). is / takes

II. Finish each of the following sentences in such a way that it has the same meaning as the original sentence:

1.     We couldn’t save his life because we didn’t find him earlier.

 _ Had_____________________________________________________

2.     Without your help, the boy couldn’t have met his parents.

_ If ________________________________________________________

3.     It’s my opinion that you should take more exercise.

_ If I________________________________________________________

4.     Peter failed the exam because of his laziness.

_ If ______________________________________________________________

5.     She had a headache. Otherwise, she could have come with us.

_ If ________________________________________________

giúp e vs ạ. E cảm ơn ạ

Câu 1.        Cho dãy các chất metylamoni clorua, valin, glyxin, propylamin, anilin. Số chất trong dãy tác dụng được với dd NaOH là

Câu 2.        Tính chất nào sau đây của anilin chứng tỏ nhóm amino (-NH2) có ảnh hưởng đến gốc phenyl?

Câu 3.        Anilin tác dụng được với chất nào sau đây tạo thành dung dịch trong suốt, đồng nhất?

Câu 4       Sau khi làm thí nghiệm với anilin, để rửa ống nghiệm, người ta dùng dung dịch nào sau đây?

Vật dao động điều hòa có phương trình: x = Acos𝜔t. Thời gian ngắn nhất kể từ lúc bắt đầu dao động
đến lúc vật có li độ x = -A/2 là bao nhiêu chu kì?

Một người xách một xô nước đi trên đường, mỗi bước đi được 50 cm. Chu kì dao động riêng của nước
trong xô là 1s. Người đó đi với vận tốc bao nhiêu thì nước trong xô bị sóng sánh mạnh nhất?

So sánh anilin và phenol; giống và khác nhau ở điểm nào?