单项选择题

As an outstanding scholar, he has become （）to the research team.

A. senior
B. junior
C. indispensable
D. independent

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It is estimated that, currently, about 50000 species become （）every year.

A. extinct
B. instinct
C. distinct
D. intense
单项选择题
We hoped to be able to get married early this month, but things didn't （）as we had expected.

A. work out
B. come by
C. fill up
D. lay down
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