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1. （只要看一眼这封信） ____________ ， will convince you that you have been taken in.
2. Please don’t stand in the kitchen, you’re________________ （挡路了） .
3. ________ （如果暴露在空气中） , iron will react with the oxygen of the air.
4. ________ （对听到的事情感到震惊） , he placed both his hands on his mouth.
5. We’d better struggle for the future ________ （而不是为过去而懊悔） .
