42. When Peter was at collage, he paid a __________ visit to the library.
| A．often | B．frequently | C．recent | D．Frequent |
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I will buy the dictionary as it is very expensive.
__________________________________________________
ever since while as soon as since before until howeverI'll leave __________ I'm ready.
One can't see air；__________，it does exist.
The telephone rang __________ I was in the garden.
__________ we came to the university, we have learnt quite a lot，
I've never got any letter from him __________ he left.
Only two days remained __________ the examination.
He worked in Hong Kong __________ his father found a job for him in Canada.
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