He went home for lunch____ the clock struck twelve.
| A．while | B．immediately | C． right away | D．at once |
If _____ to look after luggage for someone else, inform the police at once.
| A．asked | B．to ask | C．asking | D．having asked |
—It is the first time that I ________ here in Hong Kong.
—What great changes！It’s ten years since I ________here last time.
| A．have been；came | B．have been；have come |
| C．am；came | D．was；have been |
His report was so exciting that it was __interrupted by applause（掌声）.
| A．constantly | B．constant | C．seldom | D．never |
The thief was about to leave the room when the police ______ and caught him.
| A．got up | B．turned up | C．kept up | D．made up |
He was very busy yesterday, otherwise he ____ to the meeting.
| A．would come | B．came | C．would have come | D．had come |