A. compulsory
B. optional
C. illegal
D. unnecessary
A. distance
B. stage
C. space
D. level
A. seeing
B. see
C. saw
D. to see
A. boring
B. expensive
C. easy
D. min
A. happily
B. unhappy
C. happiness
D. happy
A. photocopy
B. to photocopy
C. photocopying
D. photocopied
A. thinks
B. is thinking
C. is thought
D. thought
A. doesn't work
B. won't work
C. isn't worked
D. won't be worked
A. to leave
B. left
C. leaving
D. having left
A. get it enlarging
B. have it enlarging
C. have it enlarged
D. set it enlarged
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