文档介绍：
) band
(2) instructor
(3) turn in上交;归还
(4) signed by their parents:由他们的父母签名的。这是一个分词短语作定语修饰sheets.
(5) so I can be sure they are putting in enough time:这样我才能确定他们投入了足够的时间。这是so that 引导的目的状语从句，其中that省略。
二、英语故事
Monkey went to the hospital on a lark, and entered the doctors room. At that moment, the doctor wasnt in, and hed left his [doctors] clothes in the room.
Monkey thought this would be fun, so he put on the doctors clothes, that white lab coat we see so often. Just then a little bear came to the hospital to see the doctor. This was the little bears first time at the hospital, and he didnt know what hospitals were like [lit: didnt know the hospital situation]. All he knew was that doctors wear white lab coats.
The little bear had shown up at the hospital carrying a basket of peaches (this was the payment he had prepared to give to the doctor), and he happened to walk into the room where Monkey was. Little Bear didnt know Monkey, but he recognized the white lab coat, so he asked Monkey to examine him.
Monkey originally just [intended to] hav