A. for B. on C. in D. at
A. if he works hard B. why he stays up so late
C. why is he so busy D. when he will stop working
A. a B. an
C. the D. /
A. in B. at
C. up D. off
A. it B. her
C. him D. them
A. flies B. grapes
C. ants D. hams
A. period B. relative
C. relationship D. spirit
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