Would you like some bread ?----Sorry, I am not ______ .
My stomach feels terrible, I think I ate ___________ at lunch time.
We tried our best to ______, but she didn’t stop crying.
By the time of last year, she ______ the piano for five years.
—Listen! Peter is singing in the classroom! —It _____ be him. He has gone back to his hometown.
Keys _______ opening the lock in the door.