根据短文内容及所给首字母提示，补全所缺单词，使短文意思完整、通顺。

     We are middle school students and we are busy with our lessons. Some people think we should

c__1__more on our studies. It's a w__2__ of time for us to volunteer to help others. But I think v__3__

is great. I not only feel good about helping others, but also get to s__4__ time doing what I love to do.

And by volunteering I have learned many things that I have n__5__ learned in class. So if  I have an

o __6__ , I'd like to visit an old people's home to c__7__up the old people there. I'd also like to help

s__8__ kids in hospitals. I love kids and I plan to put my love to good u_ 9 _  by working in hospitals.

In a word, I'd like to help people who n _10__ help. If everyone helps out a bit, the world will become

more colorful.

根据《放射性同位素与射线装置安全许可管理办法》（环境保护部第三号令）第三十二条规定，转入放射性同位素的单位应当于转让前向所在地省级环境保护主管部门提交放射性同位素转让审批表，并提交下列（）材料。

A.转出、转入单位的许可证

B.放射性同位素使用期满后的处理方案

C.注册核安全工程师审批的处理意见

D.转让双方签订的转让协议