11. A significant proportions of the plants and animals of Hawaii exists nowhere                        a                                b                  c  else in the world.               d 答案：  A 解析：  注意到句首的“a”,所以这里用单数形式，改为：proportion.   12. You will not be able to pass your examination except you study harder than you                   a                                  b               c             do now. d 答案： B 解析： 表达“除非”的意思；except 改为unless。   13. Some bosses dislike to allow people to share their responsibilities; they keep                           a              b all important matters tightly in their own hands.  c                       d 答案：  A 解析：  dislike doing sth. 指“不喜欢做…”。   14. Generally speaking, the bird flying across our path is observed, and the one                                            a                               b staying on the tree near at hand is passed by without noticed.                              c                       d 答案：  D 解析：  without是介词，后面应该接名词或动名词，同时，该句又是被动的含义所以应改为:  without being noticed.   15. On the whole, ambitious students are much likely to succeed in their studies           a                                b than those with little ambition.         c    d 答案：  B 解析：  此句是一个包含了比较级的句子，所以B项应改为： are more likely.

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