—Mom,          I play computer games?—Yes, you can. But you have to finish your homework first. 

You ___ drink wine before driving, or the police will take your license away.

—There aren’t any toys in our suitcase．Where have you put them?—Oh, no．That old lady sitting next to us ______ have taken ours by mistake.

It’s funny that Howard___ speak to you like your boss. 

One of our rules is that every teacher      wear school uniform while attending the school flag-rising ceremony.