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

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 es, 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