Word Form :
1. Air __________ makes people feel sick ( pollute )
2. ___________ air is one of the most problems we have to solve nowadays ( pollute )
3. Air pollution can _________ do harm to people's health ( direct )
4. All ___________ should be given in writting to the secretary ( complain )
5. _____________ are fighting to save the marine life ( conserve )
6. Because of my __________, I didn't want to go out ( sick )
7. David found Tuoi Tre's newspaper ___________ ( use )
8. He lives __________ because he is very successful ( happy )
9. Her ___________ was cut off when she didn't pay her bill ( electric )
10. I have a number of ____________ about the service in this hotel ( complain )