There are various advertisements in our lives and we can see them wherever we go.   Mostly, advertisements try to persuade people     1     (buy) a product or service, or to believe in     2     idea.   But PSAs are meant to educate people about health, safety, or problems     3     affect public welfare .

When it comes to advertisements, we must use our     4     (intelligent) and we shouldn’t     5     ( cheat) by them. Many of them use     6     (attract) pictures and clever languages to advertise their products,     7     (bring) huge profits for those businessmen.

    8     (fortunate), not all ads play tricks     9     us though, China began a nationwide campaign in 1996, and since then all kinds of PSAs       10     (appear) around the country. You have probably seen or heard some of them and they can be learnt by us .