=>
6. C : sự ích kỷ
7. C disadvantaged bất lợi, thiệt thòi
8. B : lễ kỉ niệm
9. A family planning
10. B kiến thức
11. D A-the
12. C who 
13. B because + mệnh đề : bởi vì
14. A is supported
15. D It's time : đã đến lúc
16. B get used to Ving : quen làm gì
17. A câu điều kiện loại 3
18. B to be surprised
19. C thank for Ving
20. C we're ready

II/
1. Daisy apologized to Jack for not coming to visit him the summer before.
2. If it hadn't rained heavily, Tom would have gone to school yesterday.
3. Before I felt a little better, I had taken some medicine.
4. Do you remmeber sending them the letters yesterday?
5. He said to her that he was sure she would understand that problem more if he explained it to her then.