23．You shouldn' t come in here leaving the customers_________at the counter
| A．wait | B．to wait | C．Waiting | D．waited |
—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 |
Sometimes our opinions differ _________ what we choose to observe and how we deal with what we’ve observed
| A．which | B．since | C．because | D．because of |