1、It suddenly occurred to him ______ he had left his keys in the office.
A.whether
B.where
C.which
D.that
2、Compared with last year, the sales this year ______ by 20 percent.
A.rose
B.raised
C.arose
D.aroused
3、Only under special circumstances ______ to take make-up tests.
A.permitted are freshmen
B.freshmen are permitted
C.are freshmen permitted
D.are permitted freshmen
4、There ______ a great many accidents last year.
A.were
B.are
C.is
D.was
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