3．It makes a sense to work on the problem before it gets out of control.

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　　答案：去掉a　make sense to do sth. "做某事是明智的，合乎情理的"，为固定用法，故去掉a。

　　4．Neither the teacher nor the students is content with the result.

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　　答案：is→are　neither ... nor ... 连接两主语时，谓语动词应遵循"就近原则"。

　　5．The plan was put forward at yesterday's meeting, in my opinion, is quite practical.

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　　答案：去掉was或was前加which/that　该句中已有谓语动词is, 故put forward at yesterday's meeting为过去分词短语作后置定语，修饰作主语的名词plan；也可用定语从句作定语修饰先行词plan，因此添加定语从句的关系词引出定语从句，关系词在从句中作主语，先行词指物，所以在was前加which/that。

　　Ⅲ.语法填空

　　China will allow all couples to have two children，__1__ (give) up its decades­long one­child policy, the Communist Party of China (CPC) __2__ (announce) after a key meeting on Thursday.

　　The change of policy is intended to balance population development and meet the challenge of an aging population, according to a communiqué (公报)__3__ (issue) after the Fifth Plenary Session of the 18th Communist Party of China (CPC) Central Committee held from Monday to Thursday.

The proposal must be approved by the top legislature (立法机关) __4__ it comes into force.