Cho hình chóp SABCD có đáy ABCD là hình bình hành.

a) Xác định giao tuyến của (SAB) và (SCD); (SAD) và (SBC).

b) Gọi M\(\in SC\), tìm giao tuyến của (ABM) và (SCD).

c) Gọi N\(\in SB\), tìm giao tuyến của (SAB) và (NCD).

Cho hình chóp SABCD có ABCD là hình bình hành tâm O.

a) Gọi (n) là mặt phẳng qua DC cắt SA và SB tại M, N. Chứng minh CDMN là hình thang.

b) Gọi I là giao điểm của MC và DN. Chứng minh S, I, 0 thẳng hàng.

Cho tứ diện ABCD. I và J theo thứ tự là trung điểm của AD và AC, G là trọng tâm tam giác BCD. Xác định giao tuyến của hai mặt phẳng (GID) và (BCD). Tìm thiết diện của mặt phẳng (GIJ) với hình chóp ABCD. Thiết diện là hình gì

37. This course will provide you.. .new knowledge about Asian cultures.
A. about B. with  C. for  D.to

38. My classmates decided....the picnic due to the bad weather.
A. to put off B. putting off C. having put off D. put off

39. Playing games too much prevents some boys........... gaining high result in study.

A. about B. from C. to D. with

40.After we ..... all our homework, we played chess.

A. have done  B. had done C. will done  D. had been done

41. We will go with him as soon as we ... the task. C. finish

A. finished  B. wil have finished

C.finish  D. have been finished

45. If only Tom were here with us now, ......

A. he could have helped us solve this problem 

B. he will be able to help us solve this problem 

C. he could help us solve this problem 

D. he could be helped us solve this problem

28: In a language class, students are usually ... into a few groups for their easy practice.

A.enjoyed B.comprised C. consisted D. divided

29. ...... your parents would feel secure.

A. Were you to be offered a well-paid job B. Should you offer a well-paid job job

C. If You had been offered a well-paid job D. If you offered a well-paid job

30.in vietnam, children always ... their parents when they become weakerA.turn down B.look after C.make up D.look for

31.most of the children ... in extanded families often have better life skill
A. showing off B. taking out C. growing up D. setting up.

32. Vietnamese parents are willing to collaborate with the school in educating their children.

A.contribute  B. associate C. inspire D. ignore

34.The man asked his son ... the day before

A. where had he gone B.where did he go C.where he would go D.where he had gone

35. They could have bought something cheaper if they ... to the fair ealier
A. had come B. had came C.came D.will come

36. Nam's sister is considering ...  a gap year or applying for a job. 

A. taking B. to take  C. to have taken  D. having taken

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following question

9: You will have much more free time ... each member in your family shares the housework.

A. but for B. unless C.provided D.otherwise

10: He works hard but he finds it difficult to ... ends meet.

 A .do B.take C.make D.have 

13. If you live in an extended family, you ... by your grandparents

A. would be looked after  B.will be looked after C.will look after D.will looked after

14: By the time I .....  to buy this house, I had consulted an expert

A.have decided B.decided C.will decide D.decide

15. What would you do if you ... to promote

A.offered  B.were offered C.had offered D.offer

16. Nowadays both husband and wife should.... hands to support the family

A.lend B.give C.join D.shake

 17. This company would have been bankrupt ... foreign countries'investment. 

A.suppose that B.but for C.otherwise D.unless 

18. .....  young children be looked after carefully, they will be always optimistic

A.should B.had C.were D.if

21. She got a bit hot under the ... when a colleague started criticised her work 

A.forehead B.collar C.pillow D.hand