—Listen!Helen is singing in the next room.—It _____be Helen .She has gone to Beijing.
They _______ some books from the library last week.
Liu Dehua, Zhou Jielun and Lin Junjie are famous _______ their pop songs.
Pop music is _______ music.
—How much is it _______ piano lessons?—It’s¥100.
—Jane, can you play _______ baseball?—No, I can’t. But I can play _______ violin.