While watching TV,
____.
A. the doorbell rang B. the doorbell rings
C. we heard the doorbell ring D. we heard the doorbell rings
---Cliff, I lost your ball at school. I suppose I should pay for it.
---Oh.____. It was just an old ball anyway.
A. Take it easy B. By no means C. You got it D. Forget it
The time he has devoted in the past years ____ the disabled is now considered ____ of great value.
A. to help; being B. to helping; to be C. to help; to be D. helping; /
____ only 20 minutes to go before the train left, I felt uneasy in the taxi to the railway station.
A. For B.I had C. With D. As
It is ____ you deal with difficulties that shows ____ you are really like.
A. what; what B. how; what C. how; that D. which; how
As is natural, a man as old as he ____ be very forgetful.
A. can B. should C. would D. must
