This bookcase is for me. (改为否定句)This bookcase _____ _____ for me.
A. is not
B. are not
C. not is
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He is waiting for a bus at the bus stop. (就画线部分提问) ______ ______ he waiting for a bus?
A. Where are
B. Where is
C. What is
We are going to listen to the stereo. (改为一般疑问句) _____ you _____ to listen to the stereo?
A. Do, go
B. is, going
C. Are, going
They are doing their homework. (就画线部分提问)_____ are they _____?
A. What, doing
B. What, do
C. Which, doing
George is working hard. (就画线部分提问)_____ _____ George ______?
A. How are, working
B. How is, working
C. How are, work