[例31] These people have made great __39 (contribute) to China with their work. (茂名二模)
解析：在句中作及物动词have made的宾语，要用名词形式；表示作贡献，其前面没有不定冠词时，习惯上用复数，故填contributions。
③在形容词性物主代词后，或者在“冠词(+形容词)”后，用名词形式。如：
[例32] …the remains date from this period because of their __38__ (similar) to those found elsewhere. (2008年广州二模)
解析：在形容词性物代词(their)后应当用名词，故填similarities。
[例33] With the large numbers of students, the ________ (operate) of the system does involve a certain amount of activity.
解析：在冠词后，要用名词，故填operation
④修饰动词、形容词、副词，或整个句子，作状语，用副词形式。如：
[例34] ?As I looked 32 (close) at this girl, I fount that… (2008年深圳一模)
解析：修饰动词looked，作状语，用副词，故填closely。
[例35] There must be something 40 (serious) wrong with our society. (2008潮州期末)
解析：要求填的词修饰形容词wrong，作状语，用副词，故填seriously。
[例36] Singles are flocking(涌向) to the Internet 33 (main) because their busy lifestyles leave them little time… (2008年惠州三模)
解析：修饰because引导的原因状语从句，修饰整个句子，作状语，用副词，故填mainly。
⑤有可能是词义转换题，词类不一定要变，主要是考查具有与词根意义相反的派生词，需根据句子意思及前后逻辑关系，在词根前加un—, im—等，在词根后加—less等。如：
[例37] People certainly have a variety of reasons for going back to school but one important thing to know is, no knowledge is ________ (use).
解析：作表语要用形容词；又由句意可知，作者是表达“没有什么知识是无用的”，故填useless。
[例38] Your mistake caused a lot of ________ (necessary) work in the office.
解析：在名词前作定语，仍用形容词形式；但根据句意，“错误引起了许多不必要的麻烦事”，故填unnecessary。
⑥括号中所给词为动词时，也不一定是考动词的时态语态或非谓语动词，而是考词类转换；若是形容词或副词，有可能是考查其比较等级。
[例39] …there was a lot of information about the city’s well-known tourist 34 (attract)… (2008年广州一模)
解析：尽管attract是动词，但这是考查词类转换的；在句中作介词about的宾语，用名词，故填attractions。
[例40] The other frog went on jumping as hard as he could…He jumped even __36_ (hard) and finally made himself out. (2008年期末)
解析：联系前句，又有even(更加)的提示，可知这里用比较级，故填harder。