A. interesting / interested
B. interested / interesting
C. interest / interested
D. interests / interest
A. sent
B. were sent
C. has been sent
D. was sent
A. to
B. for
C. against
D. by
A. helping
B. to help
C. help
D. helps
A. clean
B. to clean
C. cleaning
D. cleans
A. made
B. have made
C. have done
D. did
A. collecting
B. collector
C. collect
D. collection
A. at
B. on
C. since
D. for
A. to go
B. going
C. went
D. gone
A. gone
B. went
C. to go
D. going
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