82. I think that the meal is well worth $80 without a discount(没有折扣的情况下值80美元).

【点评】well worth，“值”，后跟动名词或名词；discount 折扣。

83. Facing the fierce competition from other companies(面对来自其他公司的激烈竞争), the automobile manufacturer is considering launching a promotion campaign.

【点评】横线处要填的是一个非谓语从句，根据句意可知前后主语都是the automobile manufacturer，因此用现在分词形式。

84. As far as hobbies are concerned, Jane and her sister nearly have nothing in common / hardly have anything in common(几乎没有什么共同之处).

【点评】have something in common有共同点，注意表示否定时副词的使用。

85. Only after many failures have I realized that I cannot succeed with luck merely(我才认识到仅凭运气是不能成功的).

【点评】本题考查only位于句首的倒装。这里强调的是过去的事情对现在造成的影响“不能成功”，因此应用现在完成时态。

86. But for the survival instinct which nearly all creatures have, more species would have been extinct from the earth(更多的物种就可能已经在地球上灭绝了).

【点评】but for，“要不是，如果没有”，这里考查虚拟语气，后面应该用would + have done的形式，强调这种非真实的虚拟对将来可能发生的情况的影响。