—Whose books are these? —Maybe ________ Lucy’s.

My mom always tells me that _________/'nʌθɪŋ/ is difficult.

—Boys and girls, are        reading English books? —Yes,        are.

Look at those dogs. _______ are not _______dog.

— Alice, is this you dictionary?— Oh，no, it’s not _______.  Ask Tom. He is looking for ____.