--Did you telephone the manager’s office? ---Yes.He ____ back before 9 this morning.

At the beginning of the new term, the teacher asked several students to help _______ the new books to the students in the class. 

_______ is known to the world, the Chinese in many places _______ the old tradition.

She was so sad because she failed in the math test . Let’s ____ her _____.

It was a bit doubtful at first, but it ____  to be a really good idea.