18. Person A : Where is Tim ?
Person B : He might be next door .
What is the function of the modal auxiliary verb " might " in the reply? ( )

61、We should make a clear ( ) between 'competent' and 'proficient' for the purposes of our discussion.

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.