11.  At last, I found the rror is in the printing.

12.  It caped the letter "I".

13.  When I told his this result, he opened his mouth, last fifteen seconds.

14.  Then, he said in a very dejected voice: "I have spent so much time on it.

15.  I had believes that it was a very hard question which few people could work out.

16.  " I thought I was lucky, because , when I work it yesterday .

17.  My eyes were so tired that I believed the question had the latter "I" by mistake.

18.  Otherwise, I would work it like Cuozongci.

19.  But, besides his, I had to do the chemical exercises which had eleven pages, had to do the English exercises which has twelve pages, had to go over the English lessons, had to go over the political lessons for he coming examination on next Tuesday.

20.  I can't finish all the work.