1.  untidy

2. activity

3. unpopular

4. used

5.medical

6.neighborhood

7.addicted

8.juicy??

9.invention

10.useful

IV.

1. untidy

2. activities

3. unpopular

4. useless

5. medical

6. neighborhood

7. addictive

8. juicy

9. invention

10. useful

V.

1. watching

2. had lived

3. is cooking

4. to buy

5. taking

6. do - speak

7. go

8. will help

9. to eat

10. are going to have

I.

1.cough

2.cold

3.common

4.a

5.year

6.symptoms

7.less

8.cure

9.is

10.to

II.

1. You don't have to finish the work today.

2. Why didn't you go to school yesterday?

3. Lan doesn't swim as well as Hoa does.

4. Could you tell how to get to the station?

5. Nam used to drive on the left.

III.

1.Last night I ate a lot of because the food is delicious. 

2. Doing morning exercises and balanced diet enough to have healthy lifestyle.

3. She has learnt reading and writing at the age of four.

4.You should eat many varieties of food without eating to much anything.

5. At the age of sixteen, Marie curie left school and went to France to study.