The parts of the machine which experience a lot of friction have to be made from ______ materials.

单项选择题The boy has learned from fairy stories that what at first seems a ______, threatening figure can magically change into a most helpful friend.

单项选择题The problem with employing （）people is that they often don’t stay in the job for long.

A.overpriced
B.overqualified
C.overrated
D.overwhelmed