. .............. bat who fell upon.................. ground and was caught by................ weasel pleaded to be spared his life. ...... ..weasel refused, saying that he was by nature ................... enemy of all birds. .................. bat assured him that he was not .................. bird, but ............... mouse, and thus was set free.

'A' should be used to fill the first blank since the bat is introduced for the first time. The article 'the' should be used before 'ground' since the ground is a general term (like the Earth, the Sky). 'A' should be used before the weasel. 'The' should be used before the weasel since the weasel has already been introduced. 'the' should be used before enemy since it states a general concept. 'The' should be used before 'bat' since it has already been introduced. 'A' should be used before both 'bird' and 'rat' since the bat describes himself to be a member of a large group.

A, the, a, the, the, the , a, a is the correct order. Therefore, option D is the right answer.