根据句意和汉语注释，在答题卡标有题号的横线上，写出单词的正确形式。
【小题1】I’m so helpful that it's my pleasure (please) to help give a seat to somebody in need.
【小题2】The final-exam is ing. The students are actively (active) revising for tests.
【小题3】Because many factories pour waste water into the river, we must take action to change thepolluted (pollute) environment.
【小题4】It’s known to all that this trail is the farthest (far) one we have ever walked.
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解析：
【小题1】此题考查固定句型结构it’s my pleasure to do sth表示乐意做某事。
【小题2】此题考查副词，用来修饰revising表示积极地。故用actively。
【小题3】此题考查过去分词表示被动意义，被污染的环境，故填polluted。
【小题4】此题考查形容词的最高级的形式，far的最高级是farthest。