The witnesses ________ by the police just now gave very different descriptions of the fight. (2013·陕西,14)
41. —Well, it's getting late. I must be going. Thank you again for inviting me to the party. —________
40. —Shall Tom go and play football? —Not ________ he has finished his homework.
39. Was ________ Bill, ________ played basketball very well, ________ helped you repair your bike?
38. —You've left the light on. —Oh, ________. I'll go and turn it off.
37. No one can be sure ________ in a million years.