U4t6 Complete thesentences 1) Since ____ allcars sold in the United States have been equipped with seat belts. 2) Seat belts arealso called ____. 3) One studyshowed that ____ percent of those killed in auto accidents could have beensaved . 4) Unfortunately belts are worn only by____ percent of drivers and passengers in cities. 5) In Australia ,where there is such a law, deaths in auto accidents have decreased ____percent.