IV.
1. Life in the city is always busy.
2. Don't spend too much of your time playing video games.
3. Video games can be addictive, so player must be careful.
4. Children should take part in outdoor activities with friends.
5. She will get used to the noise of the traffiec soon.
6. Children shouldn't often go to the amusement center.
V.
1. Minh went to the dentist yesterday because he had a bad toothache.
2. The dentist looked at his teeth and told him not to worry.
3. The dentist filled cavity in his tooth last week.
4. Most children feel scared when they come to see the dentist.
VI.
1. for
2. at, in
3. on
4. for, on
5. in
6. in
7. to
8. at