情态动词表义务与禁止 — 英语填空题
题目
在社区法治宣传角，志愿者小林正在张贴新告示。请根据句意和中文提示，用正确的情态动词填空（每空一词）。Cyclists ___ (必须) stop at red lights, and they ___ (禁止) ride on the pavement, or they will be fined. Also, people under 16 ___ (不必) pay for the traffic safety lecture—it is free for them.