习题：

　　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） .
　　

　　答案：
　　1.A glance at this letter
　　2. in the way
　　3. If exposed to the air
　　4. Shocked at what he had heard
　　5. rather than regret for the past