_____ to a second language should take place in elementary school.
A. Expense
B. Exposure
C. extent
D. excess
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It took her a while to _____ to living alone.
A. alter
B. apply
C. adjust
D. adopt
At what age are children able to d_____ between right and wrong?
The a_____ of the security arrangements has been questioned.有人质疑安全措施是否充分。
The f_____ of the heart is to pump blood through the body. 心脏的功能就是把血液输往全身。
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