do you like it?—It is fantastic.

__________ are my sisters．This is Alice，and this is Lily．

Li Na plays____________ tennis very well. She has become _____________first Asian woman to reach a Grand Slam(大满贯) final.

Is the man standing outside the teacher’s office Mr. Zhou? –No, it ______ be him. He has gone to Hong Kong for an academic conference.

What _______useful book it is!—Yeah, it tells you how to play _____ guitar.