根据汉语提示完成句子。

1. Please  _____  (举手) when you'd like to answer my questions.

2. Some parents _____   (担心把手机给……) to  their children.

3. _____  (你认为) they will come before 10 o'clock?

4. My brother won first place in the _____  (400米比赛).

5. Don't _____ (同陌生人交谈) with your cell phone.

环境管理体系中组织应建立文件程序，对（）进行监测和测量，保证监测活动按规定进行。

A．核心环境因素和非核心环境因素

B．与核心环境因素有关的运行与活动

C．可能具有重大环境影响的运行与活动的关键特性

D．环境的重要影响因素