Tính các số hữu tỉ x sao cho

a, x - y = 2( x + y ) = x : y

b, x + y = xy = x : y

Tìm phân số \(\frac{x}{9}\)( x \(\in\)Z ) sao cho

\(\frac{x}{9}< \frac{4}{7}< \frac{x+1}{9}\)

1. I spent three hours to complete my homework last night

=> It ......................................................................................

2. It's not easy to learn to speak another language fluently.

=> Learning ..........................................................................

3. I think you should tell the police about the accident.

=> If I ........................................................................................

4. Keeping the environment clean is very important.

=> It's .....................................................................................

5. It's three years since I last spoke to her.

=> I haven't ..........................................................................

6. The last time we played football was in 2007.

=> I haven't ...............................................................

7. The ambulance go to the hospital in eight minutes.

=> ..............................................................................

8. Hurry up or we'll be late for the concert.

=> If we don't .....................................................................

9. Unless we water these flowers, they'll die.

=> If .....................................................................

10 . If someone doesn't put the coal in the fire will go out.

=> Unless.........................................................

Choose the best answer.

1. Hoa and Lan arrived (enough early/ early enough) to begin the class.

2. I have (money enough/ enough money) to buy a new lap top.

3. Nam ran (enough fast/ fast enough) to win the race.

4. The movie isn't (enough interesting/interesting enough) for me to see.

5. Children should run (enough slowly/ enough slowly) so that they will not fall.

6. Hoang worked ( hardly enough/ enough hard / hard enough ) to pass the exam.

7. It has rained (enough hard/hard enough) to flood the area.

8. There is still (time enough / enough time ) for us to finish the exercises.

9. The shoes are (so small that/such small shose that ) they don't fit me.

10. It was ( such a hot milk that / such hot milk that ) she couldn't drink it.

Put the verbs into the correct form : present perfect or past simple.

1. I ____ (lose) my pen. I can't find it anywhere.

2. We _______ (see) a road accident near the shopping center this morning.

3. Nam _______ (buy) a new dictionary yesterday .

4. His hair is short. He ________ (have) a haircut.

5.Last night my father ________ (arrive) home at half past ten. He _______ (have) a bath and then ____ (go) to bed.

6. ________ you (visit) One-pillar Pagoda when you were in Ha Noi?

7. My bicycle isn't here anymore. Somebody________(take) it.

8. A: When ________ you (start ) school ?

B: When I was six

9. I _______ (not/eat) anything yesterday because I ________ (not/feel) hungry.

10. The glasses look very clean. ____________you (wash) them ?

11. Why _________ Long (not/want) to play soccer last Sunday?

12. I don't know Hung's sister. I __________ ( never/meet) her.

Complete each sentence with one of these verbs in the correct form. ( Verbs of Liking )

Buy - chat - listen - read - search - talk - use - watch - watch

1. Do you mind buying me a newspaper on the way home ?

2. I spent almost three hours __________ photos of Olympic champion on the net.

3. I enjoy _______ to Michael Jackson's song.

4.When the teacher came in , everybody stopped _________.

5. My brother dislikes _________ violent movies.

6. I don't like ___________ because it wastes a lot of time.

7. My mother loves _________ magazinnes.

8. Our English teacher enjoys ________ jokes.

9. Everybody hates _________ this advertisement.

10. Most of us are interested in ___________ the Internet.