单词拼写。

1. Two guards are standing there to look after the _________ (安全) of those personal possessions.

2. You have to make sure about the _________ (分配；分发) of these goods to each house.

3. This project is _________ (运作) very well-more and more children are getting what they need.

4. We're concerned about the fate of the _________ (代替) teachers.

5. Don't worry. It's just a r_________ (例行的) medical examination.

（B）在磁体或______的周围存在着磁场．磁场最基本的特性就是对放入其中的其他磁极或______有力的作用．