题目内容：

Long time ago, people made all their own things. But they found it hard ________ everything for themselves. So people started to spcialize in different kinds of jobs. Cities and countries do this, too. Some have a lot of resources, while ______ have a lot of people. Each place is special. And then, trade comes up. Although trade may be neither easy _________ safe, modern transportation can be really _________ for moving things. Moving things ______a lot and can be expensive. However, it really changes our lives, and we can enjoy things from almost everywhere. We can’t live without it now!        specialize專門從事; resource 資源; trade貿易; transportation 交通

1.A. to make    B. made    C. been making    D. to be made

2.A. the other    B. other    C. another    D. others

3.A. or    B. but also    C. and    D. nor

4.A. helpful    B. help    C. helpless    D. helping

5.A. takes    B. spends    C. costs    D. produces