9．English is a language shared by several diverse cultures, each of ________uses it differently.

　　解析：句意：英语是几种不同文化所共享的语言，只是每种文化对这门语言的使用是不同的。根据 uses 可知主语应是单数形式，且此处 which 引导非限制性定语从句。

　　答案：which

　　10．I didn't become a serious climber until the fifth grade, ________ I went up to rescue a kite that was stuck in the branches of a tree.

　　解析：先行词为 the fifth grade，在后面定语从句中做时间状语，故选用关系副词 when。句意：我直到五年级才成为一名严格意义上的攀爬手，当时我爬到树上去取一个落在树杈上的风筝。

　　答案：when

　　Ⅱ.形容词的比较级

　　1．The more careful you are, ________ (good) the result will be.

　　解析：the＋比较级，the＋比较级。

　　答案：the better

　　2．His garden is________big as mine.

　　解析：as＋形容词原级＋as，表示"与......一样......"。

　　答案：as

　　3．________ (big) of the two bags belongs to me.

　　解析："the＋比较级"指两者中较......的。

　　答案：The bigger

　　4．I think the film is boring. I can't see any________ (bad) one.

　　解析：can't 与比较级连用，表示最高级含义。

答案：worse