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。 After three years of ▲ , she left her husband at last.
Mobile phones are ▲ used around the world now.
We should try our best to help the ▲ people.
Computers are really one of the greatest ▲ .
▲ exchange is a way of building a bridge between nations.