1 came - was
2 spoil
3 will become - was
III
1 good
2 necessary
3 pollution
4 saving
IV
1 A regurlarly
2 B provide
3 A dump
4 A polluted
V
1 I suggest that Hoa and Huong should join our club
2 Since Hoa has a broken leg, she can't go to party.
3 Nga runs slowly.
4 If Hoa doesn't hurry, she will be late.
