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III.

1. I told a joke but nobody laughed.

2. You must study harder or you will go into another classes.

3. The city suffers from air pollution and water pollution.

4. I knew her family so I did what I could for her. 

5. We can't afford energy - saving light bulbs because they are too expensive.

IV.

1. They suggested that he finishing his assignment quickly.

2. She was tired so she went to bed early last night.

3. I suggest collecting plastic bags on the beach.

I.

1. Thank you

2. Although

3. piority

4. considerate

5. which

6. who

7. whom

8. whom

9. It's nice of you to say so 

10. terrible

11. distinguishes

12. of

13. B

14. D

15. C

16. A

17. A. has just written -> has just been written

18. C. who -> which

< ảnh 1 tớ k thấy từ cần điền nên k làm được, sr cậu nha :((( >

Chúc cậu học tốt :3