--- Excuse me, is there ____ book by Mo Yan?---Yes, it’s on _____ bookshelf over there.
Mike promised ______ hard from now on.
We have a lot of homework______. We are very busy today.
Helen ______ books at the moment.
—Lisa, are you going to play ______ violin after school this afternoon? —No, and I’m going to play ______ chess with Tina.
—Is this your eraser? —No, it isn’t______. I think it’s______.