---I think he lives _____ No.386 West St. ---Are you sure _____ that? You’d better make sure.
It’s easy ________ chess.
How long does it take you _____ to work?
_____ our group, Li Fei often goes to bed late _____ school nights.
—What time do you usually get _____? —Well, _____ six thirty.
There are ______ rules in my family, so what can I do?