单项选择题

These are their motives for doing it.()

A. reasons
B. excuses
C. answers
D. plans

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单项选择题
Teaching students of threshold level is hard work but the effort is very worthwhile.()

A. precious
B. rewarding
C. worth
D. challenging
单项选择题
He expressed concern that the ship might be in danger.()

A.worry
B. difficulties
C. need
D. danger
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