请你用never,ever,already,yet,for,since填空
1.I have ___never_ seen him before,so i have no idea about him.
我以前从没见过他,所以我知道他是谁
2.Jack has __already__ finished his homework __since__an hour ago.
since+时间点an hour ago,杰克已近在一小时前完成了作业
3.Mr.Wang has tanght in this school __for__ten years.
For+时间段,王老师在这所学校教了19年书
4."have you __ever___seen the film?" "no,I have_already____ seen it."
5."Has the bus left_yet__?" "yes,it has __already______left."
巴士已经离开了吗、是的,已经离开了