Ⅰ.根据句意、首字母或中文提示写出单词
【小题1】Air _______(污染)becomes a big problem in Beijing.
【小题2】The old man doesn't feel________(孤单的)at all. His son often sees him from the city.
【小题3】Our government has done many things to i______the farmers’ lives.
【小题4】He and my aunt Mary will get_______(结婚)soon.
【小题5】The steel factory used to put its_______（废料）into the river.