按课文内容填空 In ten minutes I had seen______ that could be seen in the fish, and started to look for the Professor——who had, _______, left. Half an hour passed——an hour—— ______ hour; the fish began to look disgusting. I turned it _______ and around; looked it in the face——ghastly. I must not use a magnifying glass, ______ instruments of any kind. Just my two hands, my two eyes, ______ the fish: it seemed a ______ limited filed of study. With a feeling of desperation again I looked at that fish. I pushed my finger ______ its throat to feel _____ sharp the teeth were. I began to count the scales in the different rows, until I was convinced ______ was nonsense. At last a happy thought struck me—— I would draw the fish; and now with surprise I began to discover new features in the creature. Just then the Professor returned.