Victor apologized for_____ toinform me of the change in the plan.[ ]

Excuse me， are these books____ – No， they are classmate’s.

watched _______ one-act play, whichwas played by _______ 11-year-old boy.

I am________your suggestion________we should spend more time on this project.[ ]

are found on all kinds of trees,butthey differ greatly_____ size and shape.