单项选择题

(Thirteen hundred) medical professionals, (all of which) have been trained to treat drug dependency, (attended) the annual convention (sponsored) by a society.

A．Thirteen hundred
B．all of which
C．attended
D．sponsored
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To control (quality), and (making) decisions (about) production are among the many responsibilities of an (industrial) engineer.
A．quality
B．making
C．about
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We have arranged to go to the cinema on Friday, but we can be ______ and go another day.
A．probable
B．reliable
C．flexible
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