Not everyone has realized what_______ important part the balance of________ nature plays in their life.

(安徽省马鞍山市2009届高三第一次教学质量检测)If you are         the thunderstorm,you’d better stay in the low-lying areas  

David was bad at his studies, so when I was told he did well in the final exam this time, I found it really ______.

I’m sure that if you make good use of your ______ time, your English will be improved in a short time.

 ---- Don’t you think that was a ________ moment? ----- Yes, we were almost ______ to death by the earthquake.