The children do not know how to themselves decently at the party.
A. act
B. perform
C. behave
D. advance
网友回答
A. act
B. perform
(答案→)C. behave
D. advance
解析：考查动词辨析：A. act行动，B. perform表演，表现，C. behave行为举止D. advance进步，behave oneself举止得体，句意是：孩子们不知道怎么在聚会上行为举止有礼貌。选C。