The Japanese scientists have found that scents ________ efficiency and reduce stress among office workers.
A enhance
B amplify
C foster
D magnify
查看答案
All the students have to ________ to the rules and regulations of the school.
A confirm
B confront
C confine
D conform
He ________ his head, wondering how to solve the problem.
A scrapped
B screwed
C scraped
D scratched
As soon as the boy was able to earn his own living he ________ his parents’ strict rules.
A defied
B refuted
C excluded
D vetoed
The helicopter a light plane and both pilots were killed.
A coincided with
B stumbled on
C tumbled to
D collided with