某中学每年都在全校开展“思灾难学应对之道 重细节立安全之校”的主题活动,活动首先是安全知识讲解和安全疏散演练。这警示我们①青少年学生要提高防范和自救意识 ②这活动能杜绝一切对未成年人的伤害③社会、家庭和学校要对学生进行安全教育 ④学生要掌握自我保护的方法和技巧
Born into a family with three brothers,David was ________ to value the sense of sharing.
You had better ________ some time every day for sports so that you can keep yourself energetic.(2012·福建)
The present situation is very complex,so I think it will take me some time to ________ its reality.
Emergency line operators must always ________ calm and make sure that they get all the information they need to send help.
Happy birthday, Alice!So you have ________ twenty-one already!