参考答案及解析：
82. him out of buying a car(考点：搭配talk sb. out of doing sth。和动名词作介词宾语)
83. Keeping a sense of humor helps(考点：单词及动名词作主语)
84. he had (no choice but) to confess his crime(考点：单词与搭配)
85. somebody must be speaking ill of them (考点：搭配及情态动词表示判断)
86. it hard to resist the temptation of ice cream(考点：搭配，不定式作宾语及it作形式宾语)