______ I had time, I would have run round that lake again. A. If B. Unless C. Had D. When 24. Not only ______ a promise ,but he also kept it. A. had he made B. he had made C. did he make D. he makes 25. ______ I would see you here. A.Little I dreamed B. Little do I dream C. I dreamed little D. Little did I dream 26. There ____ . A.come they B. they come C. they are come D. they will come 27. ______ that he could not speak for a long time. A.So frightened was he B. So frightened he was C. Was he so frightened D. Frightened was he 28. Only when class began ______ that he had left his book at home. A.will he realize B. he did realize C. did he realize D. should he realize 29. Only when you have finished your homework _____ go home. A. can you B. would you C. you will D. you can 30. Seldom ____ any mistakes during my past few years of working here. A. would I make B. did I make C. I did make D. shall I make