As we all know,light (travels)faster than sound .光比声音传播的快,这是一个公认的事实,是一个自然规律,所以不管全文是现在时还是过去式,这一类表达都用一般现在时
As we all know,light (travel)faster than sound
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Light travel faster than sound.=Sound ___ travel so ___ as l
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light_____(travel)faster than sound
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Light travels much faster than sound.
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It's known to all that___light travels faster than__sound.
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As is known to us all,light________faster than sound．
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Light travels faster than sound.（同义句）
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81.________ light travels faster than sound,lightning appear
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The teacher said light travels faster than sound___
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____is well-known is ____light travels faster than sound.
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Light travels faster than ----- 是noise还是sound,为什么