单项选择题

The sign reads "In case of ______ fire, break the glass and push ______ red button."

A．不填；a
B．不填；the
C．the;the
D．a;a
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单项选择题
My grandma began to learn English ______.
A．in her fifties
B．in her fifty
C．at fifties
D．at fifty
单项选择题
______ late in the morning, Bob turned off the alarm.
A．To sleep
B．Sleeping
C．Sleep
D．Having slept
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