单句语法填空
1．The assistant asked us to_turn (turn) off the lights when we left the lab.
2．Our teacher saw the empty seat next to me and asked where he had_gone(go)．
3．After the examination, my teacher told me that failure is (be) the mother of success.
4．He told us that he had attended a ceremony three weeks before .
5．I asked him whether he would stay at home or go to see a film that night.
