III. Rewrite the sentences.
1. I am sorry I don’t have time to come and help you with your homework.
If ______________________________________________________________
2. Let’s visit the museum this afternoon..
Why don’t ________________________________________________________.
3. The school keeper cleans the classrooms every day.
The classrooms ____________________________________________________.
4. “Why don’t we go out for a while?”
He suggested _____________________________________________________.
5. He forgot his umbrella, so he got wet.
Due to ___________________________________________________________.
6. At the weekend I get up later than during the week.
During the week I __________________________________________________
7. The last time Henry smoked a cigarette was in 2005.
Henry hasn’t ____________________________________________________
8. “Why didn’t you mention the problem before?” I asked them.
I asked them ________________________________________________
9. Marco said that “ I haven’t seen this film” .
Marco said _____________________________________________________
10. Although the traffic was heavy, I arrived on time.
In spite _________________________________________________________

Cho 20,7 g mét muối cacbonat kim M vào 72,9 g dung dịch H2SO4 tạo thành dung dịch muối sunfat có nồng độ là 30%. Biết rằng kim cho mối cacbonat của kim loại M vào dd, sp vẫn cs khí thoát ra. Tìm kim loại M.

Louis Armstrong, who (1) ..................................born in 1990 and (2)
................. in 1971. He was famous …(3)…... a very famous jazz musician. He
used to be known as “ Satchmo” and this nickname stayed with him all his (4)
.............. When he …(5)….. a child in New Orleans, he learnt (6) ...............to play
the trumpet while he was living in a special home for children who had got into
trouble with the police. After he had joined various bands, he formed his own

……(7)….. Between 1925 (8) ...............1928 he made about 60 records. These
records made him one (9) ..................the first solo stars in the history of pop music
When he died, he had been making records and he had been touring all
(10)........................ the world for more than forty years.

1. Tam ………………go fishing with his brother when he was young.
A. used to B. is used to C. has used to D. was used to
2. I don't know what to do this evening. What about . ……………. to the movies?
A. go B. to go C. going D. goes
3. What she said............... me................... unhappy.
a. made / to feel b. made / feel c. made / felt d. to make / feeling
4. Let’ s go to the beach this weekend, ...........................................?
a. shall we b. do we c. don’ t we d. let we
5. My mother is very . ……………. at cooking.
A. well B. good C. popular D. famous
6. She. ……………. a letter when the telephone rang.
A. writes B. wrote C. has written D. was writing
7. He has just got an interesting . ……………. in a textile company.
A. work B. job C. occupation D. employment
8. William suggested . ……………. at home for a change.
A. staying B. to stay C. stay D. stayed
9. The . ……………. of waste paper can save a great amount of wood pulp.
A. recycle B. recyclable C. recyclement D. recycling
10. Mrs Nga forgot to . ……………. the faucet when she left for work.
A. turn off B. turn on C. turn up D. turn down
11. This book is different ..................... the one I had.
A. with B. to C. from D. at
12. What will happen if the pollution ....................... on.
A. puts B. goes C, keeps D. takes
13. I’m afraid this article is ........................ date.
A. over B. pass C. behind D. out of
14. I had to get up early, .................... I would miss the train.
A. otherwise B. if not C. but D. so that
15. I don't mind ....................... home but I'd rather ............................ a taxi.
a. to walk / to get b. walking / getting
c. walking / get d. walk / getting

dẫn 869 ml (đktc) khí So2 hấp thụ hết vào dd KOH 20% kết thúc phản ứng cô cạn dd thu đc 5,37 g chất rắn. Tính m dd KOH đã dùng

Cho hình bình hành ABCD gọi E,F lần lượt là trung điểm CD , AB . Đường chéo BD cắt AE ở G và cắt CF và H . CM: 

a) DG= GH=HB 

b) CM các tứ giác AECF , EGFH, AGCH là hình bình hành 

1.Charlie Chaplin first (appear)on screen in 1914=>

Tìm x nguyên để biểu thức A nguyên

A= $\frac{\sqrt{\mathrm{x}}-1}{\sqrt{\mathrm{x}}+1}$