Leaves are found on all kinds of trees, but they differ greatly ________ size and shape.
I’m sorry I can’t help ___________ the flowers, because I’m busy preparing for the singing competition _____________ tomorrow.
Mr. Green stood up in defense of the 16-year-old boy, saying that he was not the one_______.
Isn’t it time you got down to ___ the papers?
Bill was doing a lot of physical exercises to build up his ________.
How beautifully she sings! I have never heard _____ voice.