答案：　D

　　10．-Shall I introduce you to the detective?

　　-No，you needn't.I've met him on several____________before.

　　A．situations B．occasions

　　C．positions D．conditions

　　解析：　根据问句及答语中的No，you needn't可知后句意为"我以前见到过他好几次"。occasion作"场合"讲，符合语境。其余三项：situation形势；position位置；condition条件，均不符合语境。

　　答案：　B

　　11．The awful fire occurred at midnight when many people were asleep.____________，4 people were killed and quite a few seriously injured.

　　A．Hopefully B．Thankfully

　　C．Fortunately D．Unfortunately

　　解析：　考查副词辨析。句意为：这次可怕的火灾发生在半夜，当时人们正在熟睡。不幸的是，4人死亡，有好几个人受重伤。根据语境，这里表示"不幸"。hopefully希望，thankfully谢天谢地。

　　答案：　D

　　12．-What about playing in the snow on the playground after class?

　　-____________I wish I could play now.

　　A．What fun! B．That's right.

　　C．Cheer up! D．Not at all.

　　解析：　考查交际用语和句型。句意为：--下课后在操场的雪地里玩一会怎么样？--太有趣了，我希望我现在就能玩。根据语境，这里表示"很有趣"。fun为不可数名词，因此，这里是what fun it is to...的省略形式。

　　答案：　A

　　13．The boys were caught____________in class and as a punishment，they were made to clean the library.

　　A．whisper B．to whisper

　　C．whispered D．whispering

解析：　whisper与其逻辑主语the boys之间是主动关系，且与caught所表示的动作同时发生，故用其动词－ing形式作宾语补足语。