将下列句子译成英语。必须用上所给提示词。(每小题2分,共8分)
我爷爷亲眼目睹了福州的变化。( see, himself )
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上海的人口比北京多。( population, than )
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他说他以前从来没看过这么美的风景。( say, see )
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你应该帮你妈妈做些家务。( ought, do )
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