如何进行水位计压板的研磨？

At our school, we sometimes have a special day to help others. Last year we went to an old people's home and sang songs and performed a play for them.    小题1:  We should be allowed to take time to do things like that more often.  小题2: I want to be a teacher when I'm older, so it would be a great experience for me.   小题3:  . For example, my friend Tian Ge wants to write for a newspaper. She should be allowed to volunteer at the newspaper office once a week.    小题4:    Some students should be allowed to have Friday afternoons off to volunteer and help others.

A.   On Friday afternoons, many students are sleepy after along week of classes. B.   For example, we should visit primary schools and help teach young students. C.   The old people were very happy. D.   Other students would like to do other jobs.