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are you doing? E. Have you ever read it before? Ⅲ. 用括號內(nèi)所給單詞的適當形式完成短文。 What will our life be like by the year 2100? It’s difficult for us (1) (imagine). People (2) (live) on the earth for so many years. It is being more and more crowded and polluted. Maybe people will live on the other pla— Mars. Astronauts (3) (not be) to Mars yet so far. Let’s imagine what our life will be like on Mars. I think life on Mars will be better than (4) (those) on eart