68.The product contains no（ ）colours, flavours, or preservatives.

57.He will have to（ ）his indecent behavior one day.

56.It will take us twenty minutes to get to the railway station,（ ）traffic delays.

55.The first two stages in the development of civilized man were probably the invention of weapons and the discovery of fire, although nobody knows exactly when he acquired the use of the（ ）.

54.At three thousand feet, wide plains begin to appear, and there is never a moment when some distant mountain is not（ ）.

53.She would have been more agreeable if she had changed a little bit,（ ）?

52.He is quite worn out from years of hard work. He is not the man（ ）he was twenty years ago.

51.They overcame all the difficulties and completed the project two months ahead of time,（ ）is something we had not expected.

50.It is futile to discuss the matter further, because（ ）going to agree upon anything today.

49.（ ）I like economics, I like sociology much better.

48.Time（ ）, the celebration will be held as scheduled.