period one welcome to the unit & reading
ⅰ.用适当的介、副词填空
1．advertisements are also a good way to make people aware ________ the needs of others and the dangers around them.
2．we are so used ________ them that we often do not even realize how many we see and hear in a day.
3．a commercial advertisement is one which someone has paid ________ to advertise a product or service.
4．psas are often run ________ free，and are meant to educate people ________ health，safety，or any other problem that affects public welfare.
5．this statement tries to fool you _________ assuming that the toothpaste cures bad breath，yet it does not say that!
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