What does the sign over there say?— No person ______ enter the area without the official permission.

How is your English studyNot bad. But I_______ learningEnglish grammar.

Not until he retired from teaching three years ago ________having a holiday abroad.(2012·辽宁，32)

Tom, why not stop _________ a rest— Oh, no, mum. It’s so interesting that I can’t stop _________ the kite.

n ministers of the two countries hold regularmeetings,they can exchange views oninternational issues of both concern