单项选择题

Sometimes they______ their students' poor comprehension to a lack of intelligence.

A．contribute
B．distribute
C．attribute
D．oblige
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单项选择题
Perhaps there is still quite a long way to go______ these researchers can find an answer to the mystery.
A．unless
B．until
C．where
D．before
单项选择题
He is a boy of promise; he never fails to ______the expectations of his parents and teachers.
A．live up with
B．stand up with
C．live up to
D．stand up for
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