2. Please don’t stand in the kitchen, you’re________________ （擋路了） .

3. ________ （如果暴露在空氣中） , iron will react with the oxygen of the air.

4. ________ （對(duì)聽(tīng)到的事情感到震驚） , he placed both his hands on his mouth.

5. We’d better struggle for the future ________ （而不是為過(guò)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.