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Advertisements, which often use words and pictures to p____1_____ people to buy a product, or to believe in an idea, play an important p ____2____ in our lives. We can find them almost w____3___ we go. There are two main t___4__ of ads. One is called c_____5____ advertisements, which are meant to a ___6_____ a product or s ____7____. But they don’t tell customers the c ____8____ truth. The other one is called PSAs, which use a___9______ pictures and c____10______ language, are often run for f____11______. They are made to ___12____ the public. Although not all ads play t____13____ on us, when it comes to ads, we should be i___14______.