根据句子意思，填上正确的单词。
（1）         do you go to school ? I go to school       foot.
（2）               your mother go to work? She       by bus.
（3） How       your brother go to school?  My home is        .
       he goes to school on foot,         he         by bike.
（4）        at a red light.           at a yellow light. Go at a        light.
（5）     ___    __ I get to the hospital ?_      can get there         bus.
（6） There are always three lights in every country:      _,     ___ and_______.