82. Their only son has never thought

　　本题考察时态，注意从未想过应该用现在完成时来表达。

　　83. weigh your decision against its possible consequences.

　　本题重点考察权衡这个意思的表达，这里用了weigh sth against sth，表示权衡某事/掂量某事。

　　84. would he break/breach his promise/commitment to pay back the money.

　　本题考察部分倒装，当表示否定含义的词或者词组放句首时(本句是under no circumstances)，后面应该用部分倒装，此外也要注意违背承诺的表达以及时态的选择。

　　85. should not be addicted to computer games. / they should not indulge themselves in computer games / they should not abandon themselves to computer games.

　　本题考察虚拟语气，句子中有表示建议的advise等词时，从句里应该用虚拟语气should + 动词原形。

　　86. never considered working as a salesman.

　　本题考察consider的用法，consider当考虑讲后面跟动词时应该用ing形式，此外注意从事某工作的表达方式。