III
1. If the air wasn't so dirty, I wouldn't sneeze so much.
2. Their children have birth defects because the parents were exposed to radiation.
3. The air pollution leads to breathing problems.
IV
1.c
2.a
3.c
4-c
5-b
6-b
7-b
8-a
9-a
10-c
V
1.doing
2.didn't have
3.was crying/appeared
VI
1.Vinh really enjoys hanging out with friends.
2.It is very interesting to play beach games.
3. What language do most ethnic peoples in Viet Nam speak?
4.. Although the girl worked hard, her stepmother wasn't happy.
