You may ______ your teachers for help when you have problems.

___ by the teacher, Tom gotinto the classroom from the back door quietly

－Did you have a good time that day－Yes, but thetemperature was a little _______ and we didn’t wear warm clothes, so wewent home early.

He has ____________ himself to be innocent (无罪的).

I think we should give up the project.—What for You know I have spent a(n) _____ month on it. I won’t give up.