——Can I get out in the daytime?——No. The school rules state that no child _____ be allowed out during the day, unless accompanied by an adult.

John, look at the time._____ you play the piano at such a late hour?

－What is your math teacher like, Nick?－She is very kind _________ she looks a little serious. 

  —The winner is a tall and thin boy with glasses!—Well，it________ be Mike.  He doesn’t wear any glasses.

Generally my father is a mild man, but when he gets angry, he ______ be fierce.