题目内容
One-third of the area _____ covered with green trees. About seventy percent of the trees _____ been planted.
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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.
Not only he but also we _____ right. He as well as we _____ right.
What he’d like _____ a digital watch. What he’d like _____ textbooks.
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