Kể tên các thành phần trong lớp vỏ khí ? Tỉ lệ phần trăm của mỗi thành phần ?

Bỏ ngoặc rồi tính

a.(-507-123)-(277-507)+19

b.2009+{743-[2009-(+57)]}

c.(1750-59+2014)-(1720+2014)

7. Who’s Hoa________ with?

A. stays B. to stay C. staying D. stay

8. What _______the weather like in Ho Chi Minh city today?

A. does B. is C. do D. are

9. Mr. Tan doesn’t have _______time.

A. lots B. many C. little D. much

10. What ______he do in his free time?

A. do B. is C. does D. are

11. Ba runs ________than I do

A. more fast B. more faster C. fast D. faster

12. ________do you have dinner? – I usually have at 6.30 pm.

A. what B. where C. what time D. how

13. Hoa _________her hometown in Hue every summer.

A. visits B. to visit C. visiting D. visit

14. Those _______my books and pens. A. is B. be C. are D. do