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Without these naturally occurring greenhouse gases, the sun's rays {#blank#}1{#/blank#} into space {#blank#}2{#/blank#}.

Now, it is still hanging on the wall of my bedroom. {#blank#}1{#/blank#} I couldn't help thinking of my friend.

When the new law {#blank#}1{#/blank#}, the old one will be abolished immediately.

Although technology has changed the way we make friends, the meaning of friendship {#blank#}1{#/blank#} {#blank#}2{#/blank#} {#blank#}3{#/blank#}.