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

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单项选择题
He expressed concern that the ship might be in danger.()

A.worry
B. difficulties
C. need
D. danger
单项选择题
We shall take the treasure away to a safe place.()

A. clean
B. pretty
C. distant
D. secure
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