12She is the only girl_______enjoys singing Beijing Opera in the department.
A. whom
B. who
C. what
D. when
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13Such sweet words don't work________me.
A. with
B. for
C. to
D. from
14We are going to play________tennis in the afternoon.
A. an
B. a
C. the
D. /
15 I'm much________to you for your heart--warming encouragement.
A. gratitude
B. kind
C. obliged
D. thoughtful
16_______the end of each year, we'd try to show our appreciation to those volunteers who have helped to make life more beautiful.
A. On
B. In
C. At
D. By