⑵I can think of many cases __________you know nothing about .

　　A. where B. when

　　C that/which D. on which

　　解析：解答本题的关键是掌握case 在不同语境中的用法。⑴ 的答案为A。case 是"情况"，定语从句缺状语，指范围。 所以用where 或in which .句意："我能想起许多这样的情况， 在这种情况中很明显学生知道许多英语单词和短语，但是却写不出好文章。 "⑵的答案为C。定语从句中的about 缺宾语。 因此选C。意为 "我能想到许多这样的情况，你对此一无所知。"

　　9. ⑴Have you heard of the news that the English test ___________until next Wednesday？

　　⑵He made a suggestion that the English test __________until next Wednesday.

　　A. will be put off B. be put off

　　C. will put off D. put off

　　解析：⑴ 的答案为A. 。⑵的答案为B。⑴、⑵中的that 引导的都是同位语从句，但suggestion , order , advice 等词后的同位语从句要求用should +动词原形或直接加动词原形。 而句1中news 后的句子不要求用虚拟语气而是用陈述语气， 所以用一般将来时。答案为B。w.w.w.302edu.c.o.m

　　10. ⑴Look out! Don't get too close the house _______roof is under repair.

　　 ⑵ Look out! Don't get too close the house _______the roof is under repair.

　　A. whose B. which C. of which D. that

　　解析：⑴ 的答案为A。⑵的答案为C。 本题考察的是先行词在定语从句中作定语指物时，用whose 或 of which the +名词/ the + 名词+ of which 。

　　11. ⑴ __________ that the 2008 Olympic Games was a great success .

　　⑵ _________， the 2008 Olympic Games was a great success .

　　⑶ _________is that the 2008 Olympic Games was a great success .

　　A. As we all know B. What is known to us all

　　C. It is well known D. People are known

解析：解答本题要找准关键词：⑴的关键词是后面that 引导的从句，从句在句子中作真正的主语，it 是形式主语，故选C 。⑵ 的关键词是逗号， as 引导的是非限制性定语从句， 意为"正如我们所知道的"。⑶ 的答案为B。关键词是空后面的系词is， is 后面是个表语从句，what 引导的句子在句中作主语，故选B。