according to a recent survey ，four-million people die each year from diseases linked to smoking.
the latest surveys show that quite a few children have unpleasant associations with homework.
no invention has received more praise and abuse than internet.
people seem to fail to take into account the fact that education does not end with graduation.
many experts point out that physical exercise contributes directly to a person’s physical fitness.
nowadays ，many students always go into raptures at the mere mention of the coming life of high school or college they will begin. unfortunately ，for most young people ，it is not pleasant experience on their first day on campus.
in view of the seriousness of this problem ，effective measures should be taken before things get worse.