根据句意及首字母提示写出所缺单词，注意其形式。
【小题1】Police always try to p__________ us from the bad people.
【小题2】I do believe it, because I saw it with my o__________ eyes.
【小题3】We can see lots of leaves on the g__________ after a heavy rain.
【小题4】The windmill (风车) uses wind e__________to pump water (泵水).
【小题5】The old man goes to sea and c__________ fish every day.
【小题6】The meeting is very i__________and you shouldn’t miss it.
【小题7】Some people k__________ elephants for their teeth. It’s brutal (残忍的).
【小题8】It is good for us to go out by bike, because it doesn’t p__________ the air.
【小题9】After 21 days at sea, finally we sighted (看到了) l__________.