单项选择题

The teacher was busy ______ sums upon the blackboard. She was too busy ______ the students' questions.

A．to write out; answering
B．to write out; to answer
C．writing out; to answer
D．writing out; answering
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单项选择题
Research has ______ that smoking causes lung cancer.
A．directed
B．indicated
C．judged
D．resulted
单项选择题
All the students have to ______ to the rules and regulations of the school.
A．confirm
B．confront
C．confine
D．conform
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