单项选择题

When (contented), and occasionally when (hunger), cats (frequently) make a strange (sound).（）

A.contented
B.hunger
C.frequently
D.sound

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单项选择题

He stopped (for a moment) (at) the corner of the street, (wondered) which way he (should) take.（）

A.for a moment
B.at
C.wondered
D.should

单项选择题

(New uses) for plastics (were found) during (the) 1950’s and 1960’s in medicine, space, research, (industrial), and architecture.（）

A.New uses
B.were found
C.the
D.industrial

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