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　　D melted ice.
　　42 Lava bursts out where there is
　　A a crack in the earth.
　　B a mountain by the sea.
　　C a big fire.
　　D steam and gas.
　　43 When lava cools, it becomes
　　A liquid.
　　B water.
　　C smoke.
　　D hard.
　　44 According to the passage, Vesuvius has caused serious damage
　　A six times.
　　B seven times.
　　C eight times.
　　D nine times.
　　45 The phrase "stay alive" in the last paragraph can best be replaced by
　　A "burst out".
　　B "remain active".
　　C "come to life".
　　D "throw out lava".