Last winter it was very cold and ________ was a lot of snow in the north.

If there are _______ people driving, there will be _______ air pollution.—Yes, the air will be fresher.

Ann is a careful girl．She always checks her exercises to there are no mistakes．

______, but the idea of having to work more than ten hours a day without weekends discouraged me.

Sometimes I work _____ the day and sometimes _____ night. [ ]