【正确答案】Money
It's a common knowledge that everyone likes money and needs money. Without money we can not buy food, clothes and other daily necessities. Without money, we can not go to school or go to cinema or other places. No wonder some people believe that money is the most important thing in the world.
There are certain things that money can not buy. For example, a millionaire who suffered from serious cancer was willing to buy his health at expenses of his whole fortune, but he failed and soon died in despair. Many other things such as devoted friendship and real honor are invaluable and can not be bought with money either, so money is far from omnipotent(全能的).
Money can bring us happiness as well as sadness. Money is so useful that everybody seeks to possess it. Due to the lust for money, some people do not care by what means they get it. For instance, they might steal money from others and even kill other persons to get money. Therefore money has its evil side, if we do not know its correct meaning. Money can also be a curse, if we do not know how to handle it properly.