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根据词义写出单词grow bigger,better and stronger----d______.to the gr

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根据词义写出单词grow bigger,better and stronger----d______.to the greatest degree possible;total-----c_______.fighting or competing with another person,team,country------a_______.find the answer by using mathematics---c______.
The elder sister is 15 now,and the little sister is ten ,then,if the sum of their age is 51,how old are they at that time(翻译)