－What does the sign over there say?－“No person _______ bring drinks into the student computer pool.”

(2013·湖南高考)He ________ sleep, although he tried to, when he got on such a hunt for an idea until he had caught it.

 Sir, you _______ be sitting in this sitting room. It is for women and children only.

--Would you like to visit Kun Ming by yourself this summer vocation? --I’m not sure. I _____go there with my parents because of the terrible thing at the railway station.

He ________ to swim when he was five.