请你根据广告的优缺点填写一个适当的词，使短文完整。
In the modern world, advertising is _ 1 ! Some people like ads but others hate ads.
I think it often offers some advantages and disadvantages.
Some ads are very useful. They can tell people how to compare two different products so 2_
people can buy the better one. They can also help you 3 money.
However there are also some disadvantages. Some ads can be confusing or misleading. Sometimes
the words sound good but don't tell anything real. So you have to be 4 not to be cheated (欺骗).
We shouldn't believe 5 .