Ta có: 350:a (dư 14) Suy ra: 350-14 = 336 chia hết cho a

           220 :a(dư 10) Suy ra 220-10 = 210 chia hết cho a

Mà a lớn nhất

Vậy a thuộc ƯCLN(210;336)

Ta có: 210 = 2.3.5.7

           336= 2⁴.3.7

ƯCLN(210;336) = 2.3.7 = 42

Vậy a = 42

1. My uncle is a dotor. He takes care .......of........ sick people.

2. There’s nothing wrong ........about....... this pen. It writes well.

3. Eating too much candy is not good ..........for..... you.

4. These days, Mr. Minh is very busy ........with....... his work.

Hurry up or you’ll be late .....for.......... the meeting

1. the man spoke too fast for us to understand

- the man didn't speak slowly enough for us to understand

2.she is very old so she can't dance beautifully

she is too old to dance beautifully.

3. your writing is so small that i can't read it

your wirting is not big enough for me to read.

4. to learn English is easy

it is easy to learn English

5. they think speaking French is difficult

they think it's difficult to speak French.

6. it isn't easy to start looking for a job at his age

Starting looking for a job isn't easy at his age.

7. He is very old so he can't apply for that job

he is too old to apply for that job.

8. they ran too fast, so we couldn't catch them

they ran too fast for us to catch them.

9. he spoke too quickly for me to understand

he didn't speak slowly enough for me to understand.

10. Mrs Hoa was too weak to go to work yesterday

Mrs Hoa wasn't strong enough to go to work yesterday.

11. It is very cold so we can't go out

It is very cold for us to go out.

12. She couldn't move the piano because it was too heavy

the piano was too heavy so she couldn't move it.

1.it/wonderful/have holiday/paris

It is wonderful to have a holiday in Paris.

2.it/easy/her/finish/work on time

It is easy for her to finish her work on time.

3.the talk/not/easy/enough/us/do

The talk is not easy enough for us to do.

4.the robber/run/too fast/policeman/catch

The robber runs too fast that the policeman can't catch.

5. Miss Nga/not speak/clearly/us/understand

Miss Nga doesn't speak clearly enough for us to understand.

6.she/the last person/come in

She is the last person who comes in.

7. it/necessary/finish work/this afternoon

It is necessary to finish the work before this afternoon.

1) He is a famous ( act ) actor.

2) He ( apology) apologize for his wrong doing.

3) He plays soccer ( beauty ) ____beautifully_____.

4) This is the biggest ( build ) _____building___ city.

5) Bill Gates is a famous ( busy ) ___businessman_______.

6) Hoa has a fine ( collection ) ____collection______ of stamp.

7) You must ( dark ) _____darken____ the answer you choose.

8) There is no ( differ ) _______differences______ between my anser and his.

9) He speaks Englist ( fluency ) ____fluently________.

10) There is an ( excite ) _____exciting____ football match in this afternoon.

1. I (live) have lived here since I was born.

2. I (read) read his books when I was at school.

3. I can't go out because I (not do) haven't done my homework yet.

4. A lot of plays (write) have been written by Shakespeare.

5. I (not see) haven't seen her for three years.

6. The moon (see) was seen last night by Hoa.

7. She (spend) has spent my holiday here since last week.

8. Have you (have) had breakfast yet?

9. Hung has just (play) played video games.

10. Lan's letter (send) has been sent since last month.

11. Yesterday our teacher (arrive) arrived 5 minutes late.

12. Newspapers (read) are read by over 200.000 people everyday.

13. When I (arrive) was arriving at the airport yesterday, I (meet) was met my family.

14. A new school (build) was built in our village last month.

15. Peter (do) did this work last week.

16. That homework (do) has been done by Tom.

17. The Effel Tower (visit) is visited by millions of people every year.

18. They (write) wrote this essay yesterday.

19. This computer (buy) was bought yesterday by my father.

20. I (clean) cleans my house everyday.