完成下列句子（10%）  

1. 不久以后第一个工人联盟形成了.

It was not ________ _________ the first workers’ league ________ ________ _________.

2. 我们应该对中国人口老龄化问题引起注意,它对整个社会产生很大影响.

We should ________ our  _________ to the aging population in China, which will _______

a great _________ _________ the whole society.

3. 他总是很守信用,可到现在他却不见人影.

He always _______ _______ ________ , but he hasn’t ________ _________ so far.

4. 有些学生假装知道了他们不知道的东西.这是有害的.  

There are some students _________ _______ _______ _______ what they don’t really know, which is ________ to them.