We often think of future. We often wonder 1 the world will be like in a hundred years’ ti

问题补充：

We often think of future. We often wonder 1 the world will be like in a hundred years’ time.

Think 2 space. Perhaps a permanent station on the moon 3 (set up). Perhaps people will be able to visit the moon as 4. 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 had plans of this kind. And there will be cities 10 the sea. 1 what 2 of 3 will have been set up 4 tourists/visitors/travelers 5 permitting

答案：

(答案→)1 what 2 of 3 will have been set up 4 tourists/visitors/travelers 5 permitting

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