单项选择题

They did an experiment because they _____________.

A．wanted to know whose watch was better
B．liked their lab
C．wanted to repair their watches
D．had a basin of water in their lab

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单项选择题

On reaching the top floor I suddenly realized that I _______my book on the service desk.

A．had forgotten
B．left
C．had left
D．was left

单项选择题

—What about the book—Oh, very good. It's worth ________ a second time.

A．reading
B．being read
C．to read
D．to be read

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