据意填词&根据所给词适当形式填空
1.Dogscanhelpus()(find)()(lose)people.
2.Hestopsatthe()(cross)becauseoftheredlight.
3.Isit()tocrosstheroadnow?Yes,there’sthegrernman.Youcancrosstheroad().Youarein()whenthegreenlighton.(safe)
4.Peoplehave()(keep)dogsfor()(million)ofyears.