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
Although the police (are) given considerable authority by society to enforce (it's) laws, they get a relatively low salary as compared with (that) of other occupational groups which have much (fewer) authority.
A．are
B．it's
C．that
D．fewer
单项选择题
(It is said) that Einstein felt (very) (sad) about the application of his theories (onto) the creation of weapons of war.
A．It is said
B．very
C．sad
D．onto
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