---______ are you ______ for a bus? ---I'm waiting for a bus at the bus stop.
A. Where, wait
B. Where, waiting
C. What, waiting
D. What, wait
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George is working hard. (就画线部分提问) _____ is George ____?
A. What, work
B. What, working
C. How, working
D. How, work
Some children are coming out of the building. (写出同义句) Some children aren't _____ _____ the building.
A. going, into
B. going, to
C. go, to
D. go , into
The boy is sitting beside his mother. (就画线部分提问) _____ is the boy ____?
A. Where, sit
B. Where, sitting
C. What, sitting
D. What, sit
George is going to paint the bookcase. (就画线部分提问) _____ is George going to ____?
A. How, doing
B. How, do
C. What, do
D. What, doing