---What ____ his grandpa ____?---He is a worker.A. do, does B. does, do C. do, do
---Mr. Black, I find ______ difficult to play the piano well. ---Oh, I think you just need to practice more
He is too tired ______ any more.
____his surprise, he passed the exam.
_____should not be allowed to go out at night.
---My brother is a basketball player. ---And he usually_____ very hard on the playground.