I. Give the correct tense of the words in the bracket.

1. I (buy) ______________ a new house last year, but I (not,sell) ________________ my old house yet, so at the moment I (have) ______________ two houses.

2. When Ann (be) ____________ on her way to the station, it (begin) ______________ to rain. Ann (run) _________________ back to her flat for her umbrella, but this (make) ___________ her late for her train.

3. If I (not, go) ___________ to that party yesterday, I (not, feel) _____________ so terrible now.

4. My bicycle (not, wash) ________________ yet.

5. Trees (play) ______________ an important role in the natural circulation of water.

6.  The play (begin) ________________ for fifteen minutes when they (come) ___________ to the theatre

7. I (go) __________ there once a long time ago and (not, be) _______________ back since then.

8. Henry (have) _______________ a bad fall while he (ride) ________________ a bicycle.

9. Whenever she was sad, she (confide) _______________ her troubles to me.

10. Since we (quarrel) _________________ about the housework, we (not, talk) ____________ to each other.

11. He usually (wear) _______________ T-shirt, but today he (wear) _______________ pullover.

12. At 8a.m yesterday, my father (talk) _________________ on the phone with his customer.

13. His sister (quit) _______________ that company after she (graduate) _____________ from university last year.

14. When I first (meet) ____________ him, he (play) _________________ the piano for this club.

15. If the weather (be) ______________ better today, we (have) ________________ a barbecue.I.

tại sao đất nước ta dưới ách đô hộ 1000 năm Bắc thuộc mà vẫn giữ được nước?

giai thich y nghia cau noi: hai nam hoc noi ca doi hoc im lang

Mot tia sang toi guong phang va hợp với gương một góc

60do như hinh ve

a)Hãy vẽ thêm tia phan xa ,đương phap tuyến

b)Tinh goc tới va góc phản xa