My sister met him at the cinema yesterday afternoon, so he       your lecture.

——Will you stay for lunch?
——Sorry，       . My brother is coming to see me.

If you love someone, why ______ you chain him to your side, control his emotion, and even make him center on you?

--- Would you mind if I smoked here?
---I am afraid…, but if you________.

________ you happen to see Mary, would you please ask her to come here?

—Happy birthday!
— Thank you! It’s the best present I_________ for.

Mr. Smith is always on time for everything. How ________ it be that he was late for the flight?

— Catherine, I have cleaned the room for you .
— Thanks. You_______. I could manage it myself.

Don’t use water to put out the fire if oil catches fire. As is known, oil ____ float on water.

--- I saw Nancy on the way home yesterday.
--- It        be her. She’s gone to America for further study.