Many students like to recite       , which are short,beautiful and rhythmic.

________________of the students who took part in the military training（军训） is 450．

Electricity, like other forms of ______, has greatly increased in price in recent years. 

There are certain _______when you have to interrupt people who are in the middle of doing something.

Never judge a man by his _____ alone — you might be fooled by what he looks like.