A. Put the verb in brackets into the correct form.

1. If the earth suddenly (stop) …………. spinning we all (fly) …………. off it.

2. If you (smoke) …… in a non-smoking compartment the other passengers (object) ……

3. (your parents / not / be) ………………. proud if they could see you now?

4. If we (work) ……………all right, we (finish) ……………in time; but we have no intention of doing it

5. If we (have) …………….. a submarine now, we (use) …………it to investigate the seabed

6. Should you come late, they (not let) ……………… you in

7. He might get rid of his cough if he (not smoke) ……………so much

8. If someone (give) …………….you a boat what you (do) ……………?

9. Water (freeze) ……………. if the temperature falls below zero

10. He always says hello if he (see) ………… you

11. What would you do if he (resign) ……………..tomorrow?

12. Shout if you (see) …………..anything unusually

13. The engine starts if you (turn) ……………..this key

14. If he weren’t so bad-temperature, his wife (not leave) …………….him so soon after the marriage

15. What (you / say) ………………….if I offered you a job?

16. The children always (get) ………….frightened if they watch horror films

17. If it (not be) _____________ for you, I would be late

18. I can’t help feeling sorry for the hungry children. If only there (be) __________ peace in the world

19. He always talks as though he (address) ____________ at a public meeting.

20. I wish I (see) ____________ her off at the airport yesterday.

21. Tom wishes he (have) _________ enough money to buy a new car now.

22. Mary wishes she (become) _________ an astronaut someday.

23. I wish I (have) __________ a day off to visit his parents. He hasn’t seen them for ages

24. He wishes he (not/buy) ______________ that old car.

Bài 1: cho các từ chỉ các chất và các vật như sau: nồi đồng, chảo nhôm, cốc nước, bình khí ôxi, đinh thép, lắc vàng, thìa bạc, nhẫn kim cương, bút chì. Hãy lựa chọn và sắp xếp thành 2 loại vật thể và chất

Bài 2: trong các chất cho dưới đây hãy chỉ rõ đâu là chất hỗn hợp, đâu là chất tinh khiết: không khí, khí ôxi, khí ni tơ, nước biển, nước cất, muối ăn, sữa bò, đường ăn, gang, thép, photpho trắng, photpho đỏ, nước cam, nước hoa, thuốc tăng lực

Phân tích các đa thức sau thành nhân tử

a) \(^{ }3xy-6xy^2\) 

b) \(^{ }3x^3+6x^2+3x\)

c) \(^{ }x^3-x^2+2\)

d) \(^{ }x^2+4x+4-y^2\)

e) \(^{ }x^3+4x^2+4x\)

f) \(^{ }x^2+2x+1-9y^2\)

g) \(^{ }6x^2-12x\)

h) \(^{ }x^3+2x^2-x\)

i) \(^{ }x^2-2xy+y^2-9\)

j) \(^{ }x^2+x-6\)

k) \(^{ }2x^3+2x^2y-4xy^2\)

l) \(^{ }x^3-4x^2-12x+27\)

d) \(^{ }4x\left(2x+3\right)-8x\left(x+4\right)\)

e) \(^{ }2x\left(5x+2\right)+\left(2x-3\right)\left(3x-1\right)\)

f) \(^{ }x\left(x+2\right)^2-\left(x+1\right)^3+3\left(x-1\right)\left(x+1\right)\)

a) \(^{ }\left(7x+4\right)^2-\left(7x-4\right)\left(7x+4\right)\)

b) \(^{ }8\left(x-2\right)-3\left(x^2-4x-5\right)-5x^2\)

c) \(^{^{ }}\left(x+1\right)^3-\left(x-1\right)\left(x^2+x+1\right)-3x\left(x+1\right)\)