1、根据同义、反义关系猜词

Today' s teenagers seem to be more liberal in their ideas than their_______ grandparents.

A. freethinking B. traditional C. old D. happy

traditional与liberal意思相反，故选B。

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2、根据句意或段落文章的上、下文猜测词义

Klebold and Harris felt _______ and wanted to revenge against those whodisliked playing

together with them or laughed at them.

A. discouraged B. ashamed C. tired D. separated

根据下文的disliked playing together with them判断此处应为“感到孤立”，故选D。