祈使句的肯定与否定形式 — 英语填空题
题目
根据安全提示，用祈使句（肯定或否定形式）补全句子，每空一词。1. Don't ___ (run) on the stairs. It's dangerous. 2. ___ (look) left and right before you cross the road. 3. Don't ___ (play) with fire at home. 4. ___ (put) on your helmet when you ride a bike.