题目内容
As I have a meeting at four, ten minutes _____ all that I can spare to talk with you.
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_____ of the land in that district _____ covered with trees and grass.
One-third of the area _____ covered with green trees. About seventy percent of the trees _____ been planted.
The number of teachers in our college _____ greatly increased last term.A number of teachers in this school _____ from the countryside.
What _____ the population of China? One-third of the population _____ workers here.
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