解析　prepared表示做好准备的心理状态。

　　4．The accused was reported ________ that he had robbed the old lady of her gold necklace.

　　A．to admit B．to have admitted

　　C．to be admitting D．that he had admitted

　　答案　B

　　解析　根据句意可知，被指控者承认犯罪事实应是在被报道之前。故选B，用动词不定式的完成式表示该动作先于谓语动作。

　　5．________ I'm concerned，it's important to learn English well.

　　A．As long as B．As far as

　　C．So long as D．So long

　　答案　B

　　解析　as far as I'm concerned意为"就我而言"，切题。

　　6．We are all concerned about ________ advice the professor will offer on the project of the mall.

　　A．whatever B．no matter what

　　C．no matter D．however

　　答案　A

　　解析　no matter what只能修饰让步状语从句。

　　7．The first text－book written for teaching English ________ as a foreign language in the 16th century.

A．came about B．came across