题目内容
All the students have to ________ to the rules and regulations of the school.
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He ________ his head, wondering how to solve the problem.
As soon as the boy was able to earn his own living he ________ his parents’ strict rules.
The helicopter a light plane and both pilots were killed.
To ________ is to save and protect, to leave what we ourselves enjoy in such good condition that others may also share the enjoyment.
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