—Can I pay the bill by check?     —Sorry, sir. But it is the management rules of hotel that payment _____ be made in cash.

Oh, I’m not feeling well in the stomach. I _________ so much mushroom this morning.

It is hard to say what kind of person he is．Sometimes he is very friendly; at other times he ___ be very cold．

–Will you read me a story, Mummy? --OK. You ______have one if you go to bed as soon as possible.

 — _________ I use your telephone?— Yes, of course.