翻译下列句子。
1. 当官方宣布这个故事是玩笑时，成千上万的人已逃离了家园。(reveal, hoax, flee from)
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2. Welles宣布火星人已经在地球着陆。(announce, aliens, from Mars, land)
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3. 一个记者宣布意大利面的种植者已停止种植。(announce, spaghetti farmers)
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4. 当人们意识到这个故事是个玩笑时，全国的意大利面已售完。(realize, hoax, sell out)
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1. By the time the authorities revealed that the story was a hoax,
thousands of people had fled from their homes.
2. Welles announced that the aliens from Mars had landed on the Earth.
3. A reporter announced that the spaghetti farmers had stopped growing spaghetti.
4. By the time people realized that the story was a hoax, all of the spaghetti across
the country had been sold out.
(答案不唯一)