根据句子意思，用方框内所给词的适当形式填空，每词只能用一次。（5分）

they     health      easy     run      play

小题1:Liu Xiang is one of the best                in the world.
小题2:You’d better not                on the street. It’s dangerous.
小题3:Don’t eat that                food. It may cause a stomachache.
小题4:The girls bought                some flowers and a tie for their father.
小题5:Datong Bookstore is only 100 meters away. You can find it               .