B)根据句意及首字母提示写出单词。
【小题1】Water p__  is one of the biggest environmental problems in the world.
【小题2】The government is trying to improve the public s__.
【小题3】The heavy t__ on the road stopped my taxi from arriving on time.
【小题4】There's enough s__ for people to live in.
【小题5】No matter how hard the problem is, we should f__ it.