I _____ the book for two weeks. I must return it to the school library. 

My father usually       the subway to work, but today he goes to work     a bus.

----What do you think_________a perfect friend?-----Good personal qualities are the most important.

--- Have you ____ your key?--- No, I’ve ____ for it everywhere, but I can’t find it.

It’s time for test. Be quiet, please. I’m going to _____ your test papers.