空上填什么单词?

问题描述:

空上填什么单词?
Their children ride on buses to large schools which s____ all the farm families living in the area

serve服务
意思大致是农民家庭的孩子上学都乘坐这辆大吧,就是说这辆大吧是为农民家庭的孩子服务的