一、根据句意和所给的中文提示,写出句子中的单词
1.It's our duty to protect the __________ (环境).
2.There will be more air __________ (污染) if more and more people drive cars to work.
3.My father is a worker. He works in a big _________ (工厂).
4.I ______(相信) we will win the game.
5.The worker is working on the __________ (机器).