-Do you know the boy________ is sitting next to Peter?-Yes. He is Peter's friend. They are celebrating his ________ birthday.
I’ m tired out. I ______ all afternoon and I don’t seem to have finished anything.
Carol said the work would be done by Octorber, ____ personally I doubt very much.
____ one can achieve largely depend on ____ hard he works every day.
—How did you like Nick’s performance last night? —To be honest, his singing didn’t ____ to me much
Each button, when ____, provides a piece of beautiful music.