15.be like 像 ……
14.become more and more polluted 变得越来越拥挤
13.imagine that 从句 设想……
12.imagine doing sth. 设想做某事
11.imagine sth. 设想某事
10.move to sp. 搬到某地
9.feel sick 感觉恶心
8. feel ill 感觉不舒服,感觉生病了
7.help sb.with sth.=help sb.(to)do sth. 帮助某人做某事
6.go outside 外出