C．astonished D．being astonished

　　解析：选C　此处是状语从句的省略，补充完整是Though the professor was astonished to see us ...，省略了从句的主语和be动词，故C项正确。

　　7．The method seems good but it needs ________.

　　A．trying on B．trying out

　　C．to try on D．to try out

　　解析：选B　句意：这方法似乎不错，但需要试验一下。根据结构need doing/to be done可知首先排除C、D两项。try on"试穿"；try out"试验"。根据语境可知B项正确。

　　8．-My photography needs ________ development all the way to becoming professional.

　　-That's really what you need to.

　　A．timely B．effective

　　C．further D．natural

　　解析：选C　句意："在专业化的道路上，我的摄影技术需要进一步提升。""那真是你需要做的。"timely"及时的，适时的"；effective"有效的，起作用的"； further"更远的，进一步的"； natural"自然的，天生的"。

　　9．Why don't you put the meat in the fridge? It will ________ fresh for several days.

　　A．be stayed B．stay

　　C．be staying D．have stayed

　　解析：选B　"stay＋adj." 表示一种状态的持续，虽然为主动形式，但表示被动意义，D项有完成的意思，与语境不符，故选B。

　　10．She is a very gentle child, so she will never do anything that is not________ of by her parents.

　　A．admitted B．reminded

　　C．permitted D．approved

　　解析：选D　句意：她是一个乖女孩，从来不做任何父母不同意的事情。approve of "同意，赞成"。 that is not approved of by her parents是定语从句，修饰先行词anything。

Ⅱ.完成句子

　　1．你要是继续这样拼命工作，身体会吃不消的。

　　You'll wear yourself out if you carry on working so hard.

　　2．我们以公道的价格出售优质食品。

　　We sell good quality food at_reasonable_prices.

　　3．卫生部官员曾努力提高青少年对艾滋病的认识。

　　Health officials have tried to raise awareness about AIDS among teenagers.

4．众所周知，污染问题日渐严峻。