be

 There _____ to be a doctor on the train.

Be careful! Don't_ ___ the cups to the ground.

--Li Yuchun, the No. 1 Supergirl, is coming to our city to sing tonight.--Wow! _____ our evening classes could be canceled.

 We'd better finish the work as quickly as possible. _____ seems to be little time left.

—Are you going to visit Mr. Black  or  Green tomorrow?—_______,because they won't be free until the day after tomorrow.

--I will be away from home for some time. Could you do me a favor and look after my baby?--Not at all. _______.

—I wonder what the weather is going to be like tomorrow?_______That'sa good idea.

We don’t ______ our customers to be mere consumers.

Tom is so talkative. I'm sure you'll soon be familiar _______ him.

Some people who don’t like to talk much are not necessarily shy；they        just be quiet people.