根据句意及首字母提示完成单词。
(1)
Drinking is a principal c of traffic accidents.
(2)
She had spent all her life working in the (工厂).
(3)
I feel it is our duty not to p our environment.
(4)
Cats and mice have always been natural .(敌人)
(5)
My father works in the (石油) industry.
答案: 【1】cause
【1】factory
【1】pollute
【1】enemies
【1】oil