13Such sweet words don't work________me.
A. with
B. for
C. to
D. from
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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
17 I _______never be so successful without your help.
A. might
B. must
C. could
D. may