15."I'll tell Mary about her new job"."You____her last week."

A.ought to tell B.must tell

C.would have told D.should have told

16"No one was prepared for the teacher's question." "We___the lessons last night."

A.would have read B.ought to have read

C.could have read D.might have read

17.He____you more help, even though he was very busy.

A.might have given B.might give

C.may have given D.may given

18.I would love___to the party last night but I had to work extra hours to finish a report.

A.to go B.to have gone C.going D.having gone

19.---I stayed at a hotel while in New York.

----Oh,did you? You_____with Barbara.

A.could have stayed B.could stay

C.would stay D.must have stayed

20.Sorry I'm late. I____have turned the alarm clock and gone back to shop again.

A.might B.should C.can D.will

21."Did you go to see the football match yesterday?""No, I didn't feel well, but I would have gone if I____."