题目内容：

选用方框内的单词，并在答题卡标有题号的横线上，写出空缺处各单词的正确形式。每空只写一词。

1. After three years of    ▲  , she left her husband at last.

2. Mobile phones are    ▲   used around the world now.

3.We should try our best to help the    ▲   people.

4.Computers are really one of the greatest    ▲  .

5.  ▲   exchange is a way of building a bridge between nations.