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There _________a frog. He ________ in a well(井）and he never _______ out of it. He thought the sky was as big as the mouth of the well. One day, a crow(乌鸦）__________ to the well. He_________the frog and ________, "Frog, let's have a talk.” Then the frog_______ , "Where are you from?” “I fly from the sky," the crow said. The frog ____________surprised(惊讶的）and said.＂The sky is only as big as the mouth of the well.How do you fly from the sky?" The crow said, “The sky is very big. You always stay in the well, so you don't know the world is big.” The frog said, "I don't believe.But the crow said, “You can come out and have a look by yourself.”＂So the frog came out ________the well. He was very surprised. ______ big the world was!