单项选择题

If one does not pick up (his) dry-cleaning (within) thirty days, the management is not (obligated) to return it (back).

A．his
B．within
C．obligated
D．back
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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
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
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