单项选择题

When (imaginable) scientists (first) suggested the possibility that one person (could speak) directly to another (over) a long distance, few people took them seriously.

A．imaginable
B．first
C．could speak
D．over
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Sleep is (controlled) by (the brain) and (associated by) characteristic (breathing) rhythms.
A．controlled
B．the brain
C．associated by
D．breathing
单项选择题
That night, (tired) (though was he) , the Union Officer (went out) again to (look for) help.
A．tired
B．though was he
C．went out
D．look for
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