6.would have …. to outstrip and to…, and would to rave 选项有outstriping and v ing.
7. A.the fact of doing sth and doing sth enlights ... B. that doing sth and doing sth enlights...e C. because..., this fact...
8.turns to somebody as his subject. for suject for his subject to be subject
9. such as and such like ( of course such as)
10. both...and...
11.parallelism... ing...ing
12. ...., something has grown (three times) the industry s average rate. a)three times b)three times of c)at three times d)at three times that of e) I think the answer is a) or c)