A. without knocking to B. without to knock
C. without to knock at D. without knocking at
A. to be a student B. be a student
C. being a student D. am a student
A. to arrive B. had arrived
C. arrive D. has arrived
A. to wave B. being waved
C. waving D. waved
A. interested B. interest
C. interesting D. to be interesting
A. win B. in winning
C. to win D. winning
A. to read B. reading C. to be read D. for you reading
A. walking B. walked C. to walk D. walk
A. had touched B. touched C. touches D. touch
A. to think it over B. to think over it C. think it over D. of think
A. to B. please C. will D. would
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