－Look, your sister is playing the pianoover there. －She ______ be my sister. She has gone to America.A. mustn’t B.can’t C.shouldn’t D. may not

d man turned his business over to his younger son, ________made his elder son discouraged.

Every family in America has had this sort of experience______there was a price increase of nearly one-third in the past two years

I stayed at a hotel while in New York . — Oh , did you ? You ____ with Barbara .—

and we’ll finish the work on time.