一、根据句意及汉语提示完成句子
1．Don't play soccer on the ________ (公路)．It's dangerous.
2．We don't need any ________ (钱) for our lunch at school.
3．They like to live with us in the village. There's clean ________ (空气) here.
4．(中考•苏州)I'm busy at the moment, but I'll be __________ (空闲的) this afternoon.
