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It is only when we cannot see perfectly that we realize how important our eyes are.

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only when we cannot see perfectly  only when we can see well  even if we can see well  only when we realize how important our eyes are  
that; what  which; what  that; how  which; how  
only when we cannot see perfectly  only when we can see well  even if we can see well  only when we realize how important our eyes are  
we will notice that it is not moving  we cannot tell whether or not it still exists  it will be brighter than the moon  it is four years that the light we can see will reach us  
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We will see flowers only in May.    We won’t see flowers after May.    We will see flowers before May.    We will see flowers when May comes.