21. She has been teaching _____ school for ten years.

A. at B. in C. on D. with

22. My father has been working in a bank _____ we moved here.

A. for B. during C. since D. in

23. I stopped in Maid Stone _____ my sister owns a shop.

A. which B. who C. where D. that

24. Several guests _____ cars were parked outside were questioned by the police.

A. who B. which C. that D. whose

25. Picasso, _____ works inspired many artists, lived until he was a ripe old age.

A. who B. that C. whose D. which

26. He _____ to stop drinking by the doctor.

A. was advised B. advised C. is advised D. be advised

27. A lot of new machines _____ by the farm.

A. was bought B. has been bought C. have been bought D. have bought

28. The price of wheat exports _____ by the government.

A. is increasing B. are increased C. will be increased D. have been increased

29. We _____ by her because she doesn't feel well.

A. can't help B. can't be helping C. can't are helped D. can't be helped

Em cảm ơn ạ.

I- Choose the best answer:

1. I can't reach the phone because I _____ a bath.

A. am having B. have C. was having D. be having

2. Don't turn off the light. I _____ a report now.

A. read B. is reading C. am reading D. be reading

3. He _____ his house at seven a.m each day.

A. left B. leaves C. leave D. is leaving

4. When she _____, I was reading upstairs.

A. was coming B. is coming C. came D. comes

5. My mother is cooking now. She always _____ dinner for my family.

A. cooks B. cooked C. cooking D. is cooking

6. I _____ in England for a few weeks now.

A. has been staying B. am staying C. have been staying D. stay

7. It _____ hard all day last Sunday.

A. rained B. was raining C. has rained D. has been raining

8. If he knew the facts, he _____ us what to do.

A. told B. will tell C. would tell D. tells

9. Let's hurry up! We must finish _____ the wall before ten o'clock this morning.

A. to paint B. painting C. paint D. painted

10. If you _____ work hard, you'll fail the exam.

A. not work B. don't work C. won't work D. work

11.I must say that my great passion in my life is _____.

A. studied B. to studying C. studying D. studies

12. He'd rather _____ books _____ watch TV.

A. read/ than B. read/ to C. reading/ to D. reading/ than

13. Would you mind _____ me to take these chairs away.

A. help B. to help C. helped D. helping

14. Mr. Kent has been out of _____ for a year.

A. a work B. the work C. work D. works

15. I am sorry I can't help you now. I'm busy _____ my lesson.

A. to B. X C. with D. for

16. She is very _____ up with doing the same thing everyday.

A. bored B. tied C. hate D. fed

17. she doesn't enjoy looking _____ the children.

A. for B. in C. after D. at

18. The long walk is tiring. We are very_____of the long walk

A. bored B. fed C. tired D. hated

19. His friends are surprised _____ his success.

A. in B. with C. at D. for

20. He was born _____ 2nd May 1987.

A. in B. on C. at D. since 

Buff vừa thôi bạn ơi:)))

Cho hai số thực x, y thay đổi thoả mãn điều kiện \(x+y\ge1\) và x>0. Tìm GTNN của biểu thức:

\(M=y^2+\dfrac{8x^2+y}{4x}\)

Giải pt nghiệm nguyên: \(3x^2=y^2+2y+7\)

Cho nửa đường tròn tâm O đường kính BC=2R, A là một điểm bất kìa trên nửa đường tròn khác B và C. Kẻ AH vuống góc với BC, gọi E và F là chân đường vuông góc hạ từ H xuống AB và AC.

a) Cm AE.AB=AF.AC và EF^3=BE.CF.BC

b) Gọi I là điểm đối xứng của H qua AB. Cm IA là tiếp tuyến của nửa đường tròn.

c) Tìm vị trí của A để diện tích tam giác AHB lớn nhất.

Dạ em chỉ cần câu c thôi ạ, em cảm ơn ạ.

Cho x, y thoả mãn:\(\sqrt{x+2019}+\sqrt{2020-x}-\sqrt{2019-x}=\sqrt{y+2019}+\sqrt{2020-y}-\sqrt{2019-y}\)

Cm :x=y

Giải pt:

\(\dfrac{6x^2+4x+8}{x+1}=5\sqrt{2x^2+3}\)