单项选择题

A square is a flat area having four sides, any adjacent two sides of which ______ a right angle.

A．make
B．advocate
C．adjoin
D．shape
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单项选择题
Martin lay ______ on the bed all night, turning over and over in his mind the great decision he might have to make.
A．wake
B．awake
C．waken
D．woke
单项选择题
Poor health and lack of money may both be ______ to educational progress.
A．scarcities
B．stains
C．restraints
D．barriers
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