---Can you play the guitar?---________.

(2013·高考重庆卷)—What are  you doing this Saturday?—I’m not sure，but I________go to  the Rolling Stones concert.

—Would you like some______?—Thank you, but l don’t like it.

— Who’s that man over there standing in the garden? Is it Mr. White?—It __________ be him. He has gone to Shanghai on business. 

A girl calling herself Mary is waiting outside; _____ she come in now?