Vào ngày nghỉ lễ, môt trường THCS đã tổ chức cho 150 học sinh khối 9 đi cắm trại. Số tiền đóng của mỗi học sinh là như nhau

Một thư viện cho thuê sách có quy định như sau. Nếu đăng ký làm thành viên của thư viện thì đóng lệ phí là 50,000 đồng và giá tiền thuê 1 cuốn là 5000 đồng. Nếu khách thông thường thì giá tiền 1 cuốn là 10000 đồng. Gọi y là số tiền cần trả cho thư viện và x là lượng sách được thuê
1) Biểu diễn y theo x trong 2 trường hợp là thành viên và khách thông thường
2) Hùng là thanh viên của thư viện và trong 1 năm trước Hùng mất 85000 đồng để chi trả cho thư viện. Hỏi nếu hùng k phải thành viên của thư viện thì phải trả cho thư viện bao nhiêu tiền?
3) Biết Mai là khách thông thường của thư viện và Hân là thành viên của thư viện. Biết rằng trong 1 năm số sách thuê của Hân nhiều hơn số sách thuê của Mai là 2 cuốn và số tiền chi trả của Mai và Hân là như nhau. tính số tiền Mai trả cho thư viên

trộn bột sắt và bột than vs nhau thu được hỗn hợp X Đốt cháy hoàn toàn 10,8 g X thấy tạo thành 4,48 lít CO2( đktc)

a) tính khối lượng oxit sắt thu được

b) Tính thể tích oci cần dùng để đốt cháy hỗn hợp trên

16. the phone has been ring ing for a minute. Noone …………at home(must have been/
can have been/ should have been/ none of these)
17. she’s fainted. Throw some water on her face and she ………. Come round.(has to/
may/ must/ can have)
18. ………..you please refrain from smoking while the lecture is in progress? (May/ Might/
Would/ Should)
19. I ……………… persuade him as I said.(wasn’t able to/ can’t/ mustn’t/ ought not)
20. I’m sorry to bother you while you’re working, but I …………ask you a question.(can/
had to/ must/ may)
21. He couldn’t have mean it seriously. He ……….laughed at you. (would/ couldn’t/ had/
must have)
22. we …….ensure the telegram arrives in time. (had to/ must/ ‘d rather/ might)
23. he ……..keep his family because his wages were too low. (couldn’t/mustn’t/ can’t/
didn’t have to)
24. the sea was too rough that we …………swim. (couldn’t/can’t/won’t/wouldn’t)
25. …………make an appointment to see the doctor? (May I / Could I / Will I/ Shall I )
26. Perhaps there ………. A good pro gram on the radio. (might be/ will be/ can be/ should
be)
27. I ……go swimming when I was young. (a. could/b.would./ c. used to/d. both b and c)
28. ………..take this letter to the post office, please?(May you/ Must you/ Would you/
none of these)
29. in our family my father ………sit at the top of the table. (used to/ had to/ ought to/
must)
30 Do it as well as you ……………. (must/ will/ can/ have to)
31. I …………swim in this water: it is much too cold.(mightn’t/ mustn’t/ can’t/ don’t have
to)
32. you …………… imagine my surprise when I heard the news. (can/ ought to/ will/ all
of these)
33. you do some work instead of sitting there reading the paper. (would rather/ ought to/
won’t/ don’t have to)
34. be careful how you hold that jug; it ……….break easily.(may/ ought to/will/ might)
35. I’m not sure where to go for my holiday, but I ……..go to China. (should/ may/ have
to/ needn’t)
36. we had free tickets, so we ……….pay to get into the concert. (didn’t have to/
couldn’t/mustn’t/ shouldn’t

1. He …….leave early, didn’t he? (must/ had to/ has to/ ought to)

2. His eyes were so bad that he ………..read the number on the board. (shouldn’t/hadn’t to/ couldn’t/ can’t)

3. There’s the waiter. I ……..ask him for the bill. (will/ shall/ am able to/ could)

4. ………….open the door for you? (Would you like that I / Do you want that I /will I / shall)

5. ………..you be able to come to the meeting? – I’m afraid not. (Can/ will/ May/ should)

6. My car broke down so I ………..come by bus. (had to/ must/should/ could)

7. …………….ask you some questions? – OK,go ahead.(shall I / will I / should I /may I )

8. I ………….play tennis than golf. (like better to/ prefer/ ‘d rather/ ‘d better)

9. There are a lot of mistakes in this exercises. I …….. go over it again with you. (will have to/ am able to/ would/ could)

10. He was a good swimmer, so he ………. Swim to the river bank when the boat sank. (could/ can/ would/ was able to)

11. He ……….. live in the country than in the city.(would rather/ had better/ should/ might)

12. You ……….. go now. It’s getting late.(had rather/ had better/ ought/ would rather)

13. You ………..fly to London this evening provided you don’t mind changing planes in Paris.(must/ have to/ can/ ought to)

14. I ……….. to take advantage of this opportunity to thank for your co-operation. (would like/can/ am able to/ might)

15. You …………..add it up. I’m not good at figures.(have to/ ought to/ ‘d better/ both b and c)