The tall man is a ______ student.
A. return
B. returned
C. returning
D. to return
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The girl ______ next to me was my cousin.
A. is sitting
B. sit
C. sitting
D. to sit
She bought a computer ______ in China.
A. produce
B. producing
C. to produce
D. produced
I have just ______ a booth. (预定)
I think they are very ______. (专业)