单项选择题

Some of these studies (have shown) that although some people have trouble (to fall asleep), others have an (equally) difficult time (waking up).

A．have shown
B．to fall asleep
C．equally
D．waking up
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单项选择题
Confucius--a statesman, scholar, and (educator) of (great skill) and reputation--is generally held to be China's (greatest) and most (influence) philosopher.
A．educator
B．great skill
C．greatest
D．influence
单项选择题
(Should) John resign and Henry (succeed) him, we (would have had) a (more) vigorous leadership.
A．Should
B．succeed
C．would have had
D．more
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