【例如】 No one imagined that the apparently ____professor was actually a criminal. A) respectful B) respectable C) respective D) respecting respectful表示“尊敬他人的”；respectable表示“受人尊敬的”；respective则表示“各自的”；respecting 常用作介词，表示“关于”。根据句意：没有人想到这个表面令人尊敬的教授实际上是个罪犯，应选 B.No one would believe his story. It was quite ____ . A) credible B) credulous C) creditable D) incredible credible意为“可靠的”；credulous意为“轻信的”；creditable意为“高贵的”；incredible意为“不可靠的”。根据题意应选D.句意为：没有人会相信他的故事，那是相当不可靠的。 It is quite necessary for a qualified teacher to have good manner and ____ knowledge. (CET-4 1996,1) A) extensive B) expensive C) intensive D) expansive extensive意思是：广博的，泛泛的；expensive意思是：贵的；intensive意思是：精深的；expansive意思是：扩大的。根据句意：一个合格的老师必须有良好的举止和广博的知识，应选择A.