Hãy chia đúng thì ( thì quá khứ hoàn thành quá khứ đơn).
1.I _____(lose) my pen i can't fine it anywhere
2.We____(see) a read accident near the shopping center. this morning.
3.Minh___(buy) a new dictiorary yesterday.

4. His hair is very short. He___(have) a haircut.

1. i'm worried about my baskeball team perhaps they won't win i____they play well
A. I hope        B.i wish      C. i want     D.i suggest

2.when i was a child ____ a trifle
A. I we ride       B. i ride     C. i was riding     D. i use to ridiing 

3. whew dave was young he played tennis. Dave___tennis when h was young.
A. Used to play     B.plays     C.likes toplay   D. Has played.
 

4.Bill wishes he___ More money so he could buy a new bike 
A.Had      B.Have   C.Has   D.Having

5.I wish you __watching TV white I am talking to you 
A. Stopping   B.To stop    C. Stop    D.stopped

This is a very puzzling problem! I wish i____the answer
A. Knew     B. Would know    C. Knowing     D. Know

Đốt 6,72l khí CH₄ (đktc)

a, Tính cần Vo₂ (đktc)

b, Tính khối lượng nước tạo thành.