单项选择题

Those of us who are over fifty years old should get () blood pressure checked regularly.

A.their
B.their’s
C.our
D.ours

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单项选择题

On his way to school he met (), so he sent him to hospital.

A.very
B.much
C.serious
D.very

单项选择题

You should spend () in the study of the various senses and uses of the common words.

A.much
B.as
C.time
D.as