26. While Anna......................... (show). I D card to customs officer. I........................(sit) at departure.

27. Please turn off the computer if you........................ (not/use) it.

28. I can't hear him very well. What........................ (he/talk) about?

29. My mother........................ (drive) me tu fooball practice every Sunday, but this Sunday she........................ (drive) me to pool to learn how to swim.

21. As soon as she........................... (appear), will give her a teddy bear and flowers.

22. I will wait until you........................... (come) here tomorrow.

23. Miss Helen will help you as soon as she ...........................(finish) that letter tomorrow.

24. He........................... (always/ forget) to turn off light before leaving.

25. I hate living in Seattle because if...........................(awlays/rain)

16. Usually, Mr. Pike........................ (teach) us Physics, but today he........................(be) ill so Mrs. Yeng........................(teach) us.

17. For the time beings, it........................(rain) heavily so we can't go out.

18. The last train........................ (leave) the station at 2 p.m.

19. Look! A man........................ (run) after the train. He........................(want) to catch it.

20. I.........................(do) an exercise on the  present tences at this moment and I........................(think) that I........................(know) how to use it now.

Exercise1. Simle present or present or Present continuous.

11. water.......................... (consit) of hydrigen and oxygen.

12. Don't give the chocolate to Helen. She..........................(Hate) it.

13. The Sun.......................... (give) us heat and light.

14. ..........................(Peter/work) on the computer now?

Exercise1. Simle present or present or Present continuous.

1. Be quiet! The baby........................ (sleep)

2. We seldom........................ (eat) before 6:30.

3. Look! A man........................ (run) after the train. He........................ (want)to catch it.

4. The sun........................ (set) in the West.

5. It........................ (be) often hot in summer.

6. I........................ (do) an exercise on the  present tences at this moment and I........................ (think) that I........................ (know) how to use it now.

7. My mother sometimes........................ (buy) vegetables at this moment and I........................ (think)

8. It........................ (be) very cold now.

9. It........................ (rain) much in summer. It........................ (rain) now.

27. Giải tam giác ABC vuông tại A, biết rằng:

d) c = 21 cm, b = 18cm.

27. Giải tam giác ABC vuông tại A, biết rằng:

d) c = 21 cm, b = 18cm.

11. The children are playing.................................... on the beach. (happy)

12. We are looking forward to.................................... from you. (hear)

13. What we must do is to keep the earth.................................... (pollute)

14. I felt.................................... in climbing up the mouuntian. (interest)

15. They.................................... me to join their trip to the village last year. (invitation)

16. He felt strongly.................................... to her.(attract)

17. Their.................................... has lasted a lifetime. (friend)

18. We enjoy the.................................... atmosphere in Hue. (peace)

19 Many.................................... have mentioned the Aodai in their poems.

20. Dove.................................... for peace. (symbol)

ll. Correct forms of words: Nouns, Adjectves, Verbs and Adverbs.

1. To Hoai is ome of the most famous.............................. in Viet Nam. (write)

2. Role-play is................................... in developing communication skills. (help)

3. My sister want to be a fashion................................... when she grows up.

4. I need to................................... my French. (improvement)

5. There are many...................................  beaches in our society. (beauty)

6. Thanks to the................................... of television, people can enjoy different interesting progarm. (invent)

7. If we...................................  the water, we will have no fresh water to use. (pollution)

8. Mrs. John is going to...................................  all the rubbish. (collection)

9. Smoking is very................................... to our health. (harm)

10. She found it...................................  difficult to get a jod. (collection)

b)\(\dfrac{\sqrt{15}-\sqrt{5}}{1-\sqrt{3}}\)

c)\(\dfrac{a-\sqrt{a}}{1-\sqrt{a}}\)