单项选择题

(There are) twelve people (take part in) the experiment, four (working) (as) a group.

A．There are
B．take part in
C．working
D．as
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单项选择题
If you (read) the book (a second) time, (and) you will probably have quite a different understanding of the events (described in it).
A．read
B．a second
C．and
D．described in it
单项选择题
You've to (hurry up) if you want to buy (something) because (there's) hardly (something) left.
A．hurry up
B．something
C．there's
D．something
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