「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.