缺词填空。
先通读下面的短文，掌握其大意，然后根据短文内容和所给首字母，在空格内填入一个适当的词，
使短文意思完整。所填单词必须完整写出。
Advertisements are an important p__________(1) of our lives. We are so u___________(2) to them that
we don't even r_____________(3) how many we see and hear in a day. I did some r________ (4) on
advertisements. There are two main types of advertisements---commercial (商业) advertisements and public
service advertisements (PSAs). A commercial advertisement is one which someone has p_________(5) for to
promote (推销) a product or service. PSAs are often placed for f____________(6). They p__________ (7)
information with attractive images and creative language, but they are made to serve the public. PSAs are meant
to teach us and help us l (8)better lives. Since 1996, a number of PSAs have a______________(9) around
China. You have probably seen or heard some of them yourself, l__________ (10) ' Yes to life, no to drugs
(毒品)' and 'Knowledge changes life.' These ads d__________ (11) with social problems. There are also PSAs
about public service project, such as ' Project Hope - schooling every child.' All the ads are helpful, and you
can often learn a lot by f__________ (12) the advice they give.