从所给的选项中选择适当的句子完成对话（其中有两个多余选项）。
Mother: Why don't finish your homework?
Andrew: I don't understand it.____1______
Mother: Do you want to ask your teacher?
Andrew: _____2______
Mother: Why not?
Andrew: _____3______
Mother: Do you do anything wrong at school?
Andrew: ____4_____
Mother: Is there any problem with your study?
Andrew: I don't understand some of the new words.
Mother: OK. Give me your book now. ____5______
A. Because he often shouts at me.
B. Well, sometimes I don’t do all my homework.
C. It’s too difficult.
D. He likes music.
E. Let’s try and do it together.
F. I’m a good student.
G. No, I don’t.
.则当阳光与水平面成37°角时，杆AB在水下的影长为_________ m.