You'd better take a heavy coat. Sometimes it ______ be very cold.

–Have you decided where to spend your summer holiday?--Not yet. We _____ go to Hong Kong.

That man over there _____ be Mr Wang . He has gone to Yushu. 

—____ you please tell me your name?—Sure. I’m Linda.

I ________ use a clock to wake me up because at six o’clock each morning the train comes by my house.