He ________ me how to start and stop the machine.
A. showed
B. gave
C. had
D. passed
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I pressed the wrong button and the machine ____________.
A. broke down
B. broke up
C. broke out
D. broke into
_________, the workers helped me fix the machine.
A. Lucky
B. Unlucky
C. Luckily
D. Unluckily
She _________ the wrong button last time.
A. doesn’t press
B. don’t press
C. didn’t press
D. hasn’t pressed
There are ________ things to do.
A. the number of
B. a number of
C. numbers of
D. number