37.1 mean (get) to the top by sunrise.

38. I remember (read) about the earthquake in the papers.

39. I regret ( spend) so much money. 40. I was very tired, I tried (keep) my eyes open but I couldn't. 41.1 rang the door bell but there was no answer. Then I tried (knock) on the door, but there was still no

answer.

42. We tried (put) the fire out but we were unsuccessful. We had to call the fire brigade. 43. Sue needed (borrow) some money. She tried (ask) Gerry but he was short of money

44. I tried (reach) the shelf but I wasn't tall enough

45. Please leave me alone. I'm trying (concentrate). 46. I need a change. I need (go) away for a while.

47. She isn't able to look after herself. She needs (look) after. 48. The windows are dirty. They need (clean).

49. Why are you leaving now? You don't need (go) yet, do you? 50. You don't need (iron) that shirt. It needs (iron).

51. Try (not make) so much noise 52. I remember (meet) you before but I forget your name:

53. Don't forget (send) me a cable when you arrive in Ha noi.

54. He stopped (smoke) a cigarette. But it was so windy that he failed to do it.

55. Yesterday I went to Mai's party. But now I regret (go) there.

- Why? - I regret (say) that I stayed there too long.

How. long have Nam and Huong been in a relationship?

When

3. When she phoned me yetersday, it was my dinner time.

When

4. I have not seen a Chinese film for 5 years.

The last time

5. My mother went home before we arrived.

When

6. They have only recently started wearing helmets.

They did not..........

7. My teaher left the class before we arrived there.

When ......

8. During her lunch, the light went out

While

9. I have not been to the beach for 2 years

I Last .....

10. This is her first visit to Binh Duong.

This is the first time................

11. Her brother has been studying at Technology University for 2 years

Her brother started

12. How long is it since these children swam

When

13. When did you last see Mr. Brown? - How long

14. How long is it since they left school?

When

15. It's his first talk to this strange man.

It's the

15. It's his first talk to this strange man.

It's the

16. How long have you used this computer?

When

17. This dog began to bark when his guests came.

This

18. The farmer hasn't cut the grass in the garden for over ten months. It's

19. The last time the vegetable was watered was last three weeks.

-The vegetable hasn's

20. This is the first time I have seen such an interesting movie.

21. It's ten years since we last went to a contemporary stages

We haven't 22. I've never been to Hue citadel before. → This is

23. I started studying Japanese 5 weeks ago.

I've

24. The last time I saw my cousin was in June. → haven't 25. We haven't read a book about animals for ages. It's ages

26. My sister's career as a shop assistant began 4 months ago.

My sister has been

When did you last see Mr. T

how long

(a+b)² = a² + 2ab + b²

1 vật có khối lượng 2kg rơi tự do từ độ cao 10m xuống đất, g = 10m/s2

Tính thế năng của vật tại thời đi điểm ểm bắt đầu rơi và tại điểm sau khi nó rơi 1s

Để nâng 1 vật có m=50kg lên cao 10m với vận tốc không đổi ng ta cần thực hiện 1 công là bao nhiêu lấy g= 10m/s²

Một vật rơi tự do có m=4kg. Trên 1 quãng đường nào đó vận tốc biến thiên từ 2m/s đến 8m/s. Tính công của trọng lực thực hiện trên quãng đường đó biết g=10m/s²