Ⅱ. 单项填空(共15小题；每小题1分，满分15分)
21. (2012·临沂高二检测)After thinking about the problem carefully, she came to ____________ conclusion at last.
A. a B. / C. the D. one
22. A better plan was ____________ by the headmaster.
A. put out B. put away
C. put forward D. put on
23. Although this medicine can cure you ____________ your illness, it has a side effect ____________ you.
A. for; on B. of; on C. of; at D. for; in
