一、单项选择（共15题，每小题1分，满分15分）
21. --- I don’t think I can walk any farther!
--- ______. Let’s stop here for a rest .
A. Neither am I B. Neither can I
C. I don’t think so D. I think so
22.Please remind me ______ he said he was going . I may be in time to see him off.
A. where B. when C. how D. what
