=将下列汉语句子译成英语，英语句子译成汉语。
They are building a tunnel，and it will go through the mountain．
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In the 21st century，those people with old ideas will be left behind the times．
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上周这时候我们正在为考试做准备。
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我爷爷习惯早起。
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快点，否则你会迟到的。
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