解析：take up 开始，从事。

　　答案：up

　　2．He promised to come to my party but he didn't turn ________.

　　解析：turn up 出现，露面。

　　答案：up

　　3．He is keen ________ sports while I'm fond ________ art.

　　解析：be keen on 喜欢；be fond of 喜欢。

　　答案：on; of

　　4．He has a ________ (prefer) for rock climbing.

　　解析：have a preference for 偏爱......。

　　答案：preference

　　5．________ order to pass the exam, he worked hard.

　　解析：in order to 为了。

　　答案：In

　　6．I can't stand ________ (live) in noisy surroundings.

　　解析：stand 后跟动名词作宾语。

　　答案：living

　　7．He tried ________ (knock) at the back door but there was no answer.

　　解析：try doing 尝试做某事。

　　答案：knocking

　　8．He seemed to wait ______ ages. But it's not worth ______.

　　解析：for ages 很久；be worth doing 值得做。

　　答案：for; waiting

　　9．________ (obvious) he got impatient.

解析：副词作状语。