III.

1. provide 2. physical 3. getting 4. swimming 5.flu 6.health 7. exercise 8. stay 9.dry 10. weight 

C. I.

1. eat 2. school 3.fish 4.fresh 5.healthy 6.rice 7. well 8.drink 9.breakfast 10.water 

II.

1.b 2.a 3.c 4.c 5.a 6.b 7.c 8.b 9.a 10.b

D.

1. Getting a plenty of rest is really important.

2. It is easy to get a flu. We should try to keep us clean more

3. I had a toothache yesterday because I ate many sweets.

4. He has a flu. He is keeping sneezing and coughing.

5. Which activity uses more calories , walking or riding a bicycle ?

II.

1. with → for

2. habit in → habit of

3. suffer on → suffer from

4. In prevent → To prevent

5. has → had