vì x/y = 2/7 

nên x = +- 7 ; +-2

ong đấy 1s=5km suy ra 60s=300km rồi, hình như đề sai ?

1. Every morning ,I often sit in my garden and .....to my nightingale sing

A.listening B.listen C.listens D.listend

1. Stadium
2. Lucky
3. Happy
4. Country
5. Chịu
6. Library
7. English
8. Luch
9. Picture
10. Friend
11. Chair
12. Telephone
13. Bank
14. Chịu
15. Clothes