语法填空练习二 We often think of future. We often wonder 1.______ the world will be like in a hundred years’time. Think of space. Perhaps a permanent station on 2.________ moon will 3.________ (set) up. Perhaps people will be able to visit the moon as 4.________ (visit). Cheap rockets for space travel will have been developed, 5.________ (permit) long journeys through the solar system. When that time comes, people will be taking holidays in space and visiting 6.________ planets. Great progress will have been made 7.________ medicine, too. Pollution will have been controlled in a hundred years’ time. 8.________ the world will have been developed—even Antarctica. We will have used up most of the earth’s land to build our cities, 9.________ floating cities will have been built. The Japanese have already plans of this kind. And there will be cities 10.________ the sea.