19." After a confused silence , the speaker attempted a weak reply only to halt midway to
confer with his assistant and finally to admit that he had made a mistake." The two infinitive phrases after " midway " are used to ( )

60、The chances of a repetition of those unfortunate events are ( ) indeed.

59、This project would ( ) a huge increase in defense spending.

58、In winter drivers have trouble stopping their cars from ( ) on icy roads.

57、The motorist had to ( ) to avoid knocking the old woman down in the middle of the road.

56、When you're driving on a motorway, you must obey the signs telling you to get into the right ( )

55、Many people are ( ) to insect bites, and some even have to go to hospital.

54、( ) at in this way, the present economic situation doesn't seem so gloomy.

53、Firms that use computers have found that the number of staff ( ) is needed for quality control can be substantially reduced.

52、All of us would have enjoyed the party much more if there ( ) quite such a crowd of people there.

51、You ( ) Jim anything about it. It was none of his business.