One day a customs officer managed to get some fresh mushrooms(磨菇). (一天一海关官员想要一些新鲜蘑菇。) He was so __21__ what he had bought that he offered to share the mushrooms with his brother officers. When their breakfast arrived __22__, each officer found some mushrooms on his plate. "Let the dog try a piece first." suggested one __23__ officer who was afraid that the mushrooms mightbe poisonous. The dog seemed to __24__ his mushroom, and the officers then dared to eat their breakfast, saying that the mushrooms had a very strange but quite pleasant taste. An hour later, however, they were all astonished __25__ the gardener came in and said seriously that the dog was dead. Immediately, the officers jumped into their cars and rushed to the nearest hospital. Pumps(清胃器) were used and the officers had a very hard time getting rid of the mushrooms that remained in their stomachs. 21. A.careful B.the next day C.when D.pleased with E.enjoy 22. A.careful B.the next day C.when D.pleased with E.enjoy 23. A.careful B.the next day C.when D.pleased with E.enjoy 24. A.careful B.the next day C.when D.pleased with E.enjoy 25.A.careful B.the next day C.when D.pleased with E.enjoy