问题描述：
su yang listens to the teather________(carefully)than su hai my sister dances __________(carefully)
than sun yang
su yang listens to the teather________(carefully)than su hai
my sister dances __________(beautifully）than helen
than sun yang
su yang listens to the teather________(carefully)than su hai
my sister dances __________(beautifully）than helen
问题解答：
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