根据句子内容，从每组的选项中选出能匹配句子中划线部分意义的选项，选项中有两项为多余选项。

A. to produce or create sth. B. to show sth. clearly by giving proof or evidence C. the dark shape that sb./sth.’s form makes on a surface D. to accept that sth. is true E. the act of getting sth, especially knowledge, a skill, etc. F. to make sth. develop or become more active G. a rule or law that limits what you can do or what can happen

【小题1】The children progressed in the acquisition of basic skills.
【小题2】Let me demonstrate to you some of the difficulties we are facing.
【小题3】In the 19th century waterpower was widely used to generate electricity.
【小题4】Citizens of the EU can travel without restriction within the EU.
【小题5】To my disappointment, he didn’t acknowledge that he had done something wrong.