“May I speak to your manager Mr. Williams at five o’clock tonight?”— “I’m sorry. Mr Williams ________ to a conference by then.”

My parents____inHong KongThey were born there and have never lived anywhere else.[ ]

When the man came in, gun in hand, we all stood there, ______ [ ]

There are monthsin a year. monthis December.

Some of the people often ask the same question　　　the air has been polluted