---What ____ Mr. Jones ____ ? ---He is walking over the bridge.
A. do, do
B. are, doing
C. is, doing
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Look, the man and the woman _______ for the bus.
A. are, waiting
B. is, waiting
C. waiting
____ not ____ that tree.
A. Is, climbing
B. Do, climb
C. Are, climbing
Are they _____ a bus at the bus stop?
A. wait for
B. waiting
C. waiting for
You must _____ the tap. (关上水龙头)
A. turn off
B. turn on
C. turn down