Exercise 3: Add question tags to the following statements.

1.He hardly ever makes a mistake, ________________?

2. Nobody likes the play, ________________?

3. He isn’t here, ________________?

4. This is your pen, ________________?

5. Somebody wanted a drink, ________________?

6. You’ve been to Ha Noi, ________________?

7. He used to live here, ________________?

8. Those aren’t your books, ________________?

9. Neither of them offered to help you________________?

10. Nothing went wrong yesterday, ____________________?

11. Mrs. Brown usually remembered her husband’s birthdays, ________________?

12. It is not a very good book, ________________?

13. This won’t take long, ________________?

14. You don’t need me anymore, _______________?

15. It never works very well, ________________?

Exercise 2:  Change the following sentences into passive voice.

1. Mary types letters in the office.

………………………………………………………………………………………………

2. His father will help you tomorrow.

………………………………………………………………………………………………

3. Science and technology have changed human life.

………………………………………………………………………………………………

4. Peter broke this bottle.

………………………………………………………………………………………………

5. They are learning English in the room.

………………………………………………………………………………………………

6. I buy two newspapers and a magazine every day.

………………………………………………………………………………………………

7. My students will bring the children home.

………………………………………………………………………………………………

8. She gave us more information.

………………………………………………………………………………………………

9. We plant many flowers in the garden.

………………………………………………………………………………………………

10. The boys broke the window and took away some pictures.

………………………………………………………………………………………………

11. People spend a lot of money on advertising every day.

………………………………………………………………………………………………

12. Mary is cutting a cake with a sharp knife.

………………………………………………………………………………………………

13. The children looked at the woman with a red hat.

………………………………………………………………………………………………

14. They have provided the victims with food and clothing.

………………………………………………………………………………………………

15. They have changed the window of the laboratory.

………………………………………………………………………………………………

Exercise 1: Give correct tenses of the verbs.

1. She (not be) _______________ in Paris yet.

2. My cat _______________ (eat) now.

3. She usually ____________ (wash) the dishes after dinner.

4. He (watch) _______________ TV when the phone rang.

5. When I arrived, she (have) _______________ lunch.

6. He just (go) ___________________ out.

7. At 8 o’clock last Sunday, I (tidy) _______________ my room, my mother (do) _______________ the housework, my younger sisters (study) _______________

8. _________________________ (your sister/ wear) sunglasses?

9. He (go) _______________ out ten minutes ago.

10. Yesterday when I came to the Parker family, they (have) _______________ dinner.

11. David (live) _______________ here since 1988.

12. I think he (not come) _______________back his hometown.

 13. I (do) _______________ it for you tomorrow.

14. _______ she (live) _________________ in a house?

15. My best friend (write) _______________ to me every week.

Viết PHHH của lưu huỳnh đi oxit tác dụng với:

Magie oxit, Nhôm oxit, Kali hidroxit,Nước, Bari hidroxit

có các oxit sau : SO3,CO2,CaO, Fe2O3,CuO, P2O5,SiO2.

Hãy cho biết oxit nào tác dụng được với:

a. Nước

b. axit sùnuric

c, dd Kali hidroxit

EM CẦN GẤP!!! MN GIÚP EM VỚI!!

        So sánh các tỉ số lượng giác sau :

     a) Sin $30°$ và Cos $30°$

     b) Cos $50°$và Sin $47°$

     c) tan $27°$ và Cot $27°$

     d) Cot $14°$ và tan $52°$

the government said that it would ensure that basic health remained.....

A. rewardable B. commendable c. affordable D. palatable

Chonj và giải thích giúp mình.

Phép lai AaBbccDdee X AabbccDdEe sẽ sinh ra kiểu gen aabbccddee chiếm tỉ lệ bao nhiêu ? (Với 5 cặp gen nằm trên 5 cặp NST khác nhau , các tính trạng trội đều là trội hoàn toàn ). Không viết sơ đồ lai
 

Trình bày nội dung quy luật phân ly độc lập của Menđen? Điểm khác biệt NHẤT giữa các tính trạng di truyền theo quy luật phân ly độc lập và các tính trạng di truyền theo quy luật di truyền liên kết gen ?

Trình bày phương pháp phân tích các thế hệ lai với phương pháp lai phân tích của Menđen