答案：B　见上题解析。tough“艰难的”符合语境。

　　20．A.which B．that

　　C．one D．it

　　答案：C　作为旁观者是小心翼翼的，但是我们不应该陷入其中(成为一名旁观者)。而应该站出来、站起来。此处one指代前面的a cautious existence。

　　Ⅳ.语法填空

　　(2017·宁夏银川九中二模)

　　D：David　M：Mark

　　D：Hi, Mark, you look pale today. What's wrong with you?

　　M：Well, I've got just finished a small __1__(operate).

　　D：Oh, I am sorry to hear that. Do you feel __2__(good)now?

　　M：Much better. I've took the medicine which __3__ doctor had asked me to take.

　　D：Thank goodness! You had better mind your own health next time. By the way, is the doctor professional?

　　M：Oh maybe, he looks professional.

　　D：Jesus, I __4__(hear)that the doctors are not professional in some hospitals in our city, __5__ makes many patients upset. Many hospitals are not strict __6__their doctors.

　　M：I hope I am lucky. I went to the North Wall Hospital.

　　D：Oh that is a good __7__. __8__ do you know that hospital?

　　M：The ads of course.

　　D：Got it. I have seen their ads many times.

　　M：I think the ads really help them a lot.

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