选词完成下面的情景对话。

pass,   for,   doing,   am doing ,  help

Mike: What are you 1. _______?

Susan: I 2. _______ my home work.

Mike: May I 3. _______ you?

Susan: Sure!

Mike: What can I do _______ you?

Susan: 5. _______ me the pencil.

如图所示的A、B两种剪刀，在理发时应选_______种剪刀；剪铁片时应选用_______种剪刀。