题目内容
You can only be sure of ______ you have at present; you cannot be sure of something ____ you might.
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Having checked the doors were closed, and _____ all the lights were off, the boy opened the door to his bedroom.
The last time we had great fun was _____ we were visiting the Water Park.
Could I speak to _____ is in charge of International Sales please?
As a new diplomat, he often thinks of _____ he can react appropriately on such occasions.
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