The policeman helped the old woman walk _________ the road. [ ]

I should in this talent show, because I really want to be the winner.

Jack’s mother was twenty-seven when he was born. Jack is eleven this year. How old is his mother?

Must I come here at eight o’clock?-No, you ____. You may come a little later.

第一部分：单项选择—Make sure you have turned off the air conditioners before going out.—_______________.