—Listen! Is that Pingping playing the guitar?  —No. It __________be Pingping. He has gone to Beijing.

(2013·安徽安庆三模)—She looks very happy.She________have passed the exam.—I guess so.It’s not difficult after all.

He ________ sleep, although he tried to, when he got on such a hunt for an idea until he had caught it.

  I ________ hear the news very clearly since the noise outside is so loud.

— _______ I ask you something, if you are not busy?—Yes, of course you _______.