My cousin Jim didn’t himself at the party and thus left a very bad impression the guests

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(答案→)A. behave;on
B. observe; on
C. support;in
D. respect; in
解析：考察动词词义辨析和固定搭配。Behave表现，守规矩；observe观察，庆祝，遵守；support支持；respect尊敬；固定搭配leave an impression on sb给某人留下印象。句意：在聚会上我的侄儿Jim不守规矩，结果给客人留下了不好的印象。根据句意说明A正确。