改错，找出错误的选项填在括号里，并在横线上改正。
They are playing _____ table tennis in the room.
A.a B.the C.不填
Sometimes I watch TV in the afternoon,but my parents______.
A.not B.aren’t C.don’t
——____in your new school bag?
——There’re many books.
A.What’s B.What’reC.Where’s
I can the violin. I likethe violin.
A.play, playB.play, playingC.playing, play