IV. WORD FROM

1. This river is very .... ffor children to swim (danger)

2. Some ... resources cannot be replaced (nature)

3. Air is a ... of gases (mix)

4.Compost is a wonderful ..... It helps plants grow (fertilize)

5. Car tires can bev recycled to make pipes and floor ....(cover)

6. He is .... that his friend sent him a mail. (delight)

7. Share your recycling story with our ....! (read)

8. The country's .... resources includes forests, coal and oil (nature)

9. Phong usually tells us.......stories (amuse) 

IV. WORD FORM

1. It's ...... to cross the avenue (danger)

2. Compost is a wonderful ........ It helps plants grow. (fertilize)

3. The country's .... resources includes forests, coal and oil. (nature)

4. Waste paper can be .... after being recycling ( use)

5. They had a .... time in Ha Long Bay last summer (wonder)

6.The World Health .... is an international one (organize)

7. Children need to have a good .....(educate)

8. My garandmother can read .... without glasses (good)

9. Last year we had an....summer holiday (enjoy)

10. We will listen to the talk of a ..... from Friends of the Earth about protecting te environment (represent)

III. SUPPLY THE CORRECT TENSE OR FORM OF THE VERBS IN BRACKETS

8. How about (go) ..... to the restaurant ?

9. Would you mind (give) ..... me some ìnformation please ?

10. I (not/invite) ...... Mr Linh yet

11, Would you like (go) .... to the movies ?

12. Would you mind (open) .... the door ?

13. Would you please (get) ..... me a glass of milk ?

14. He (write) .... a letter yesterday 

15. You should (drink) .... a lot of milk

16. This food is too salty to (eat) ..... 

17. Mankind might (live) ...... on the moon.

18. My mother (make) .... tea now

19. She (drink).... tea every morning

20. I (lose) ... my handbag yesterday. 

Một con ngựa kéo một cái xe đi đều với vận tốc \(9km\)/\(h\). Lực kéo của ngựa là \(200N\)

\(a\)) Tính công suất của ngựa

\(b\)) Chứng mình rằng \(P=F.v\)

giải phương trình:

\(\dfrac{2}{x-3}\) + \(\dfrac{3}{x+3}\)=\(\dfrac{7x+5}{x^2-9}\)