It was a pity that the great writer died ______ his work unfinished.
The room is in a terrible mess; it __________ have been cleaned.
-Tom almost ran into a pole yesterday while driving on the highway. -I suppose he __________ too fast.
-Guess what! I have got an A for my term paper. -Great ! You __________ read widely and put a lot of work into it.
-Did you visit the museum last week? -No, we __________,but we spent too much time shopping.
-I can't believe that Jeff __________ have quarreled and fought with his boss. -Well, if one __________ ask for trouble, it just can't be helped.