—Excuse me. _______ I sit here?
—You’d better not. It’s the man’s seat.
Must
Need
Could
Should
--How long have you read this book? --_________________.
--Where is your father? --He ________ Shanghai. He’ll be back next week.
There is nobody in the room,________?
Tom asked my friend ________.
You must be very tired. Why not ________ a rest?