if引导条件状语从句 — 英语填空题
题目
用括号内动词的正确形式填空(每空一词)。1. If Tom ___ (not wear) a helmet when riding, he ___ (get) hurt easily. 2. We ___ (call) 119 at once if there ___ (be) a fire in the building. 3. ___ (keep) calm and stay where you are if the earthquake ___ (happen) at night.