1. The one -> The fisrt/ The 1st 

Ngày trong tháng phải dùng số thứ tự.

2. It is January 1st -> It is on January 1st.

3. You -> your

Trước danh từ là đại từ sở hữu.

4. nine -> nineth

1. The present study reveals the unacceptable level of air pollution in city centre.

2. There has been a progressive increase standard of living in the past over few years.

3. The tallest buildings in London are comparision with small skyscrapers in New York's.

1. visits (ngôi thứ 3 số ít)

2. do not like (số nhiều)

3. prefers (ngôi thứ 3 số ít)

4. forget (ngôi thứ nhất)

5. wakes up (ngôi thứ 3 số ít)

6. does the train arrive (ngôi thứ 3 số ít)

7. Does your class start (ngôi thứ 3 số ít)

8. do you like (ngôi thứ nhất)

9. invites (ngôi thứ 3 số ít)

10. am (ngôi thứ nhất)

5. My parents would not be sad if I passed the examination.

6. If it weren't cold, I would not stop you going outside.

7. You can only phone her if you know her new telephone number.

9. If they arrived at the hall early, they would meet the singer.

10. If they were young, they would take part in the social activities.

11. If we had enough money, we would buy the house.

12. If she comes here, will you help me give her the letter?

13. If we cut more trees, we will suffer more floods.

14. If you use the car carelessly, I won't lend you it any more.

15. If I knew many people, I would not be lonely.

16. If it were not hot, we would have lunch outside.

17. If she were not poor, she could stay in hospital for a long time.