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4, advertisers have made a close study of human nature and have classified all our little weaknesses.
make a close (careful ) study:对什么做了仔细的研究
Advertisers make every effort in order to sell their products
5, Advertisers discovered years ago that all of us love to get something for nothing.
get something for nothing ( free ): 免费得到…….
6, They devise hundreds of competitions which will enable us to win huge sums of money.
enable sb. to do: 使某人能够做某事
Eg.: Hard work will enable you to pass the examinaiton, otherwise, no way.