— Tom talked with a friend of _______ on the Internet for a long time yesterday.
—Where is your Chinese teacher?—He’s ______the meeting room.
—Who is that lovely girl?—______ is my sister.
—Excuse me, can you tell me ________?—Sorry, I’m a stranger here.
—Have you found the book ________ you lost yesterday?—Yes. I left it in the library.
Hurry up! The plane will ________ at six o’clock.