安全与危险相关词汇 — 英语填空题
题目
根据句意及所给提示，用括号内单词的适当形式补全句子，每空一词。1. It is ______ (danger) to swim in the river alone, so we must keep ______ (safe) in mind at all times. 2. The sign on the wall gives a clear ______ (warn) that the deep water area is not ______ (safety) for children.