Everyone hopes to find a good job in the city,         ?

A.  haven't they                        B. hasn't he

     If it hadn't been for his carelessness, he          the exams.

A.  must pass                            B. could have passed

C. could pass                           D. must have passed

  My house has 5 floors,             has its own bathroom.

  It's time my son went to school.

A.  It's high time for my son to go to school now.

B.  The time is over so my son went to school.

C.  My son went to school because it's time.

No sooner had I arrived than the film started.

A.  The film had begun before I arrived.

B.  The film started sooner than I arrived.

C.  When I arrived the film had already started.

 If only I had followed her advice.

A.  I wish I took her advice.

B.  I wish I have followed her advice.

C.  I regret not to take her advice.

D.  I regret not having taken her advice.

 The harder she tries,                

A.  the most she achieves

B.  she achieves the more

C.  the more she achieves

  My aunt has two children,                 

A.  neither of whom are living in the city

B.  none of them are living in the city

C.  both of them are living in the city

  The more challenging this test is,                

A.  the more interesting it is to me

B.  the more I find it interesting

C.  I find it more interesting

D.  more interesting I find it

 Published in 2005,               

A.  this book soon became popular with foreigners.

B.  he wrote this book and soon became popular with foreigners.

C.  foreigners soon became interested in this book.

D.   he soon popular with foreigners for this book.

 "No, I didn't meet him again." She said

A.  She refused to meet him again.

B.  She denied to meet him again.

C.  She denied having met him again.

D.  She didn't agree to meet him again.

 In spite of her tiredness, Lan tried to go to school to do a test.

A.  Despite she was tired, Lan tried to go to school to do a test.

B.  Lan tried to go to school to do a test, she was tired.

C.  Although she is tired, Lan tried to go to school to do a test.

 It rained heavily, so we decided to stay at home.

A.  We decided to stay at home because of the heavy rain.

B.  If it didn't rain, we wouldn't stay at home.

C.  In spite of the heavy rain, we decided to stay at home.

     We should avoid              his divorce.

 Ha Long Bay,                  last month, was recognized a World Heritage Site.

A.  which my family visited                         B. that my family visited

If you need some more information,              me.

A.  you will phone                                       B. phone

C. you phoned                                            D. you would phone

      You are not allowed to go out now              a strong storm.

A.   because of                  B. because            C. although          D. Despite

  Having read this book,                  

A.  I knew many interesting things

B.  many things interested me

C.  many things were interesting to me

D.  my interest is reading books

          she could get a good mark now.

A.  If Lan did her homework last night

B.  Had Lan done her homework last night

C.  Were Lan to do her homework last night.

D.  Unless Lan did homework last night.

  It was Mr Nam                

A.  that taught me many useful things at my university.

B.  who he taught me many useful things at my university.

C.  whom taught me many useful things at my university.

  No sooner had Nam come back home                 .

A.  that his girlfriend called him

B.  than his girlfriend called him

C.  then his girlfriend called him

D.  when his girlfriend called him

 The film was so boring that we couldn't see it again.

A.  The film was too boring for us to see again.

B.  The film was boring enough for us to see again.

C.  The film was very boring and we could see it again.

D.  The film was such boring that couldn't see it again.

     It's no use persuading him to go out tonight.

A.  It's worth trying to persuade him to go out tonight.

B.  It's a waste of time trying to persuade him to go out tonight.

C.   There's no point to persuade him to go out tonight.

D.  it's useful trying to persuade him to go out tonight.

    (A) Some people (B) have difficulty (C) to find a job (D) to support their family.

      This exercise is too difficult for us                 

  The doctor advised my brother.                to recover from his illness.

A.  stop smoking                      B. stop to smoke

Chứng minh các đảng thức sau:?

a,$\sqrt{9-4\sqrt{5}}-\sqrt{5}=2$

b,$\frac{\sqrt{2}+1}{\sqrt{2-1}}=3+2\sqrt{2}$

c,$\mathit{\text{(3+}}\sqrt{\mathit{5}}\mathit{\left)}\mathit{\right(}\sqrt{\mathit{10}}\mathit{-}\sqrt{\mathit{2}}\mathit{)}\sqrt{\mathit{3}\mathit{-}\sqrt{\mathit{5}}}\mathit{=}\mathit{8}$

d,$(3-\sqrt{5})\sqrt{3+\sqrt{5}}+(3+\sqrt{5})\sqrt{3-\sqrt{5}}-2\sqrt{10}=0$

Mọi người giải giúp mk câu này đc k ạ! 

Có bao nhiêu giá trị nguyên m để hàm số y=x+m√(x^2-2x+3) đồng biến trên khoảng (avc;dvc)? 

Cho tam giác ABC vuông tại A, có AH là đường cao:

AB/AC=3/4. Tính AB, AC, BH, HC.

cô cho bài nhưng hơi khó so với mình, mọi ngừi giúp mình với;))

Đốt cháy hoàn toàn 15,7 gam hỗn hợp X chứa hai este đều mạch hở, trong phân tử chỉ chứa một loại nhóm chức,thu được 9,18 gam nước. Mặt khác đun nóng 15,7 gam hỗn hợp X cần dùng đủ 230 ml dung dịch NaOH 1M thu được hỗn hợp Y chứa hai ancol hơn kém nhau hai nguyên tử cacbon và hỗn hợp Z chứa hai muối của hai axit đơn chức, kế tiếp trong dãy đồng đẳng. Dẫn toàn bộ Y qua bình đựng Na dư thấy khối lượng bình tăng 6,93 gam. Phần trăm khối lượng của este có khối lượng phân tử nhỏ trong X gần nhất với:

A. 28,4            B. 30,6              C. 32,8                  D. 24,5

So sánh các số sau 

√27+√6 +1 và √48

Cần pha bao nhiêu ml dung dịch NaOH có D=1,26g/ml với bao nhiêu ml dung dịch NaOH có D=1,06g/ml, để được 500ml dung dịch có D=1,16g/ml.

Cho x.y=5;x^2+y^2=18

Phân tích thành nhân tử:

A)5x-5xy-7x+7y

B)(x^2-2)^2-4y^2

C)x^2-3x-10

Rút gọn giúp mình vs ạ!

$\left(\frac{1}{1-\sqrt{a}}+\frac{a\sqrt{a}}{\sqrt{a}-1}\right).\frac{a}{\left(\sqrt{a}-2\right)\left(a+\sqrt{a}+1\right)}$

cho biểu thức A=x^2-3x+2

 a.tìm GTNN A với x>=6

b.tìm  x thuộc Z để (2x-3)/A có giá trị nguyên

Ex. Put the sentences into passive voice: ( 4pts)

1. They must do their task now.

2. They opened the road 10 years ago.

3. They allowed women to vote many years ago.

4. You should open the wine 3 hours before you use it.

5. They let their children go to the zoo last Sunday.

6. He had the neighbor mend the washing machine .

7.  It is not easy to learn English.

8. He made me clean all the plates last night.

9. Don’t close the door.

10. People say he is very rich.

11. They had the typist type all their letters.

12. I am going to ask the gardener to cut my fence tomorrow.

13. Don’t let others see you.

14. He does not need to repair the machine.

15.We had a man take this photograph when we were on holiday last summer.