问题补充：
Most Chinese children like to sleep with their parents.
They are the dark.
A. afraid
B. afraid of
C. afraid to
D. afraid in
答案：
A. afraid
(答案→)B. afraid of
C. afraid to
D. afraid in
解析：句意：大多数中国孩子喜欢和父母一起睡。他们害怕黑。Be afraid of 害怕，后接名词或动名词，the dark 为名词，故选B。
