单项选择题

The trouble with such resources as coal，oil and gas ______ that they are not renewable．

A．has been
B．are
C．have been
D．is
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单项选择题
一Excuse me，where are ______ offices —Over there．
A．teacher's
B．teachers'
C．the teacher's
D．the teachers'
单项选择题
There are ______ flowers shown in the park and ______ people go to have a look.
A. varieties of; various
B. a plenty of; many
C. various; many a
D. quite a few; quite a little
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