问题补充：
The children were surprised by the sudden of their teacher.
A. enter
B. entrance
C. entry
D. come
答案：
A. enter
B. entrance
(答案→)C. entry
D. come
解析：单词辨析。the sudden 中，sudden是形容词，用来修饰名词，enter和come是动词，排除A,D；entrance入口；entry进入。句意：孩子们对于他们老师的突然进入感到吃惊。所以选C。
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