根据短文后所给的任务，完成1-5小题

        What will our world be like in 2020? Maybe no one knows. Because we never know what will happen in the future. But it's very interesting to make some predictions. Here are some exciting predictions.
Languages
        English should still be the most popular language, but Chinese should be the second. Now, many foreign people are studying Chinese    A   their second language.
Water
        ①Water will become as expensive as oil because many rivers will disappear. We will haveto save water and pay more for clean water.
Education and Science
        Students won't go to school. They will stay at home and study online. Students from all over the world may study together    B   the Internet. We may eat more genetically (转基因) modified food. And more robots will be around us. ②Lots of danger housework will be done by them.
Living
        People will live and work under the sea. Perhaps there will be big towns, factories and farms under the sea, too. Everyone will carry a pocket computer. ③computer, the, answers, will, all, the, to, their, people, problems, give. Everyone will have telephones in the pockets, too, and they will be able to talk to their friends all over the world.