统计表明，对自己家庭境况不满意的学生，其抱负水平比一般学生低。（）
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You may leave the classroom when you ________writing.
A. will finish
B. are finishing
C. finish
D. had finished
过分追求成功很容易导致一个人的自我挫败。
A. 对
B. 错
I haven't met him for ages, but his mother ______ him every day.
A. had seen
B. sees
C. has seen
D. saw
The city ______ great changes in the past five years.
A. sees
B. has seen
C. saw
D. had seen
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