Mr. Liu is very with his students as he always tries to make his classes lively and inte

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A. familiar
(答案→)B. popular
C. similar
D. particular
解析：考查形容词和固定搭配。句意：刘老师很受学生们的欢迎，因为他总是尽力让课堂变得既生动又有趣。be familiar with sth某人对某事熟悉；be popular with sb受某人的欢迎；be similar to sth与......相似；be particular about sth对......挑剔。故选B。