根据所给首字母及释义写出单词

题目

根据所给首字母及释义写出单词
1.(p ) the things that make water,air or soil dirty
2.(s ) something that you bring back from a holiday
3.(t ) to give somebody lessons about how to do something
4.(u ) a railway line under the surface of ground in a city
5.(W ) connected with the west part of the world
6.(o ) to ask for some thing in a shop or a restaurant
7.(g ) a unit of people or things

答案

polutant:污染物
souvenir:纪念品
teacher:老师
underground：地铁
Western：西方
order： 定购, 定制
group：组