4. C -> because

5. C -> because of

6. B -> boring

Hoàn thành câu

1. I suggest turning of all lights before going out

2. I suggest we should take a shower instead of a bath to save energy

3. Unless we recycle bottles and cans , we will not save a lot of natural sources

4. Unless he takes these pills, he will not be better

5. Unless he works harder, he will lose this job

6. Unless they use a computer, their work will be very difficult to read

7. Unless someone puts the coal in, the fire will not go out

8. Unless the man arrives, we will not start the conference without him

9. My school has not won the first prize of the English speaking contest in 2016

10. She last visited her grandparents 3 months ago

11. We have cooked for the party for to hours

12. It is the first time I have been here 

13. I haven't seen Nam for 3 years

14. This hospital wasbuilt 20 years ago

15. She hasn't gone out with him for 2 years

16. This is the first time I have eaten this kind of food

17. The classrooms are cleaned everyday by the schoolkeeper

18. A new school will be built next month

19. I have been given two interesting books

20. The viilage was destroyed by the earthquake