if引导条件状语从句 — 英语词汇题
题目
根据中文提示完成句子,每空一词(含缩写):1. You will stay safe ______ (如果)you follow the safety rules in the lab. 2. We can't go hiking ______ (如果)the weather gets worse tomorrow. 3. ______ (如果)you hear the fire alarm, leave the building quickly and quietly.