I don’t know you take a bus to school.—Oh, I ________ take a bus, but it is snowing today.

They often chatted about the hardtimes______they spent together in the old days

hole process for the studies of cancer took morethan a year, the technology is moving so fast that it will soon take just weeks．

___ people gather there, talking about the film about Comrade Lei Feng.

ll put off the picnic in the park until next week, ____ the weather may be better.