阅读下面的短文，并根据短文后的要求答题。(请注意问题后的词数要求)
[1]Some expressions describe people who are important，or who at least think they are．One such expression is bigwig．
[2]In the seventeenth century，important men in Europe began to wear false hair，called wigs．As years passed，wigs began to get bigger．The size of a man’s wig depended on how important he was． The more important he was—or thought he was一                 ．Today，the expression bigwig is used to make fun of a person who feels important．People never tell someone he is a bigwig．They only use the expression behind his back．
[3]Big wheel is another way to describe an important person．A big wheel may be the head of a company，a political leader，a famous movie star．They are big wheels because they are powerful．What they do affects many people．Big wheels give the orders．Other people carry them out．As in many machines，a big wheel makes the little wheels turn．Big wheel became a popular expression after World WarⅡ．It probably comes from an expression used for many years by people who fix parts of cars and trucks．They said a person roiled a big wheel if he was important and had influence．
[4]The top of something is the highest part．So it is not surprising that top is part of another expression that describes an important person．The expression is top banana．A top banana is the leading person in a comedy show．The funniest comedian is called the top banana．The next is second banana．And so on．Why a banana?A comedy act in earlier days often included a part where one of the comedians would hit the others over the head with a soft object. The object was shaped like the yellow fruit：the banana．Top banana still is used mainly in show business．Yet the expression can also be used to describe the top person in any area．
What’s the best title of the text ?(no more than 7 words)
                                                                         
Fill in the blank in Paragraph 2 with proper words. (no more than 6 words)
                                                                         
How and when is “bigwig” used in a proper way nowadays?(no more than 20 words)
                                                                        
                                                                        
Complete the following sentence with proper words from Paragraph 3 . (no more than 3 words)
As a big wheel makes the little wheels turn in many machines, powerful people give orders for others to            .
Translate the underlined sentence in Paragraph 4 into Chinese.