Question

    Long ago, people 1. have many choices about how to travel. They often had to walk wherever they wanted to go. They carried their things on their shoulders or their backs.

2. time went by, people tried to find easier ways to travel. They learned that animals could help with the work.

To travel on rivers, lakes or seas, people learned to build ships with sails. People had learned that there 3. many ways to travel on the water.

Most travel was still not fast or easy. Few people traveled far from home. Soon one thing was invented. This invention was 4. engine. An engine is a machine that makes things move. Ships 5. longer needed sails. Instead they used steam engines to move. The Wright brothers also used a gas engine when they invented the first airplane.

Answer

1.didn't

2.As

3.were

4.the

5.no

【解析】

【主旨大意】本文是一篇说明文。文章对交通工具的发展进行了简要介绍。刚开始的时候，人们只能走着去自己想去的地方，后来人们发明了轮船，蒸汽机等工具，这样使得人们的出行方式逐渐开始变得多样化。
1. 句意：很久以前，人们对于如何旅行________有很多选择。分析句子结构可知空后为动词，此处应填助动词。根据语境及常识可知此处表示没有很多选择，根据"Long ago"可知此处要用一般过去时。故填didn't。
2. 句意：________时间的推移，人们试图找到更容易的旅行方式。As time goes by时间的推移，为固定搭配，注意句首单词首字母大写。故填As。
3. 句意：人们了解到在水上旅行有很多种方式。There be句型遵循主谓一致原则，句子时态为过去时，根据空后的many ways可知此处要用were。故填were。
4. 句意：这个发明就是发动机。根据语境可知此处表特指。故填the。
5. 句意：船________需要帆。no longer不再。故填no。