问题描述：
一道英语首字母填空!
if you want to be a friend of the earth,you must promise to t______below
if you want to be a friend of the earth,you must promise the t______below
if you want to be a friend of the earth,you must promise to t______below
if you want to be a friend of the earth,you must promise the t______below
问题解答：
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