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21.引起读者兴趣
What if the evening disappeared from the world?
如果黑夜从世界上消失了，那会怎么样呢？
What if you got hit by a truck while crossing the street?
如果你在过街时被车撞到，怎么办？
What if everyone jumped a cliff? Would you do it either?
要是别人都去跳崖，你也会去吗？
Suppose that there was no purified water, what would we drink?
假如没有纯净的水，人们喝什么？
Suppose that there was an earthquake, what would be the right way to escape？
如果发生地震，正确的逃生方法是什么？
Suppose that we missed the train, what shall we do?
如果我们误了火车，我们该怎么办？