33．Only after he had spent several nights working on the math problem_______to wonder whether the problem was wrongly set．
| A．did he begin | B．he began | C．he did begin | D．began he |
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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 |
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