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.
