A. may be working B. may have worked C. might be working D. had to work
A. had better B. had rather C. will have to D. would rather to
A. spoken B. to speak C. speak D. speaking
A. to do B. do C. that I do D. doing
A. are helping B. helped C. helping D. helps
A. believe B. to believe
C. believing D. believed
A. put B. putting
C. to put D. puts
A. teach B. teaching C. taught D. to teach
A. adjusting B. adjusted C. to adjustement D. to adjust
A.which B.at which
C.in which D.with which
A. which I think it is B. of which I think is
C. I think which is D. which I think is
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