My brother Tom was very selfish when he was a little boy.
He did not want share things with other people. For 76.
example, when he bought a chocolate cake, he put them 77.
in a secret place where I couldn't find. Then he 78.
ate it all, by himself. He never helped other. 79.
He said he is busy. That is, a game of 80.
tennis making him very busy. He did not care 81.
if something he did made people angry. For 82.
instance, on one night he played strong and 83.
loudly music till four o'clock in the morning. But 84.
he is difference now. He often helps grandma with 85.
housework, helps mom with cooking and helps
his classmates with their lessons.76.share前加to
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(答案→)76.share前加to
解析：
76.在want和share之间加to此题考查动词不定式的用法。want后接to do sth.作宾语。
77.把them改为it此题考查代词的用法。it指代a chocolate cake。
78.把where改为which或that或划掉此题考查定语从句中关系代词的用法。place在定语从句中作find的宾语，所以不能用关系副词where。
79.把other改为others此题考查代词的用法。other做代词，指代其他人，用复数形式。
80.把busy前的is改为was此题考查动词时态。这是一个宾语从句，主句用一般过去时，所以宾语从句中的谓语也要用一般过去时。
81.把making改为made此题考查动词的用法。made在句子中作谓语。
82.√
83.划掉one night前的on此题考查介词的用法。one night的意思是“一天夜里”，前面不用加介词。
84.把loudly改为loud此题考查形容词的用法。形容词做名词music的定语。
85.把difference改为different此题考查形容词的用法。形容词作系动词is的表语。