For example, there are public advertisements, which    1    (鼓励) citizens to participate in improving their neighborhood, protecting the environment, and helping other people. Over the last     2    (十年) , the government has sponsored advertisements to    3    (教育)the public on fighting AIDS, saving water, helping the poor, giving up smoking, etc. These advertisements have helped to increase public    4    (知识)about topics that used to be i    5    (忽略)by most people, and this has made our society a better place for everyone.