51. Facing the board of directors, he didn't deny ( ) breaking the agreement.

61、That was not the first time he( )us. I think it's high time we( )strong actions against him.

60、Do you know Tim's brother? He is( )than Tim.

59、I know he failed his last test, but really he's( )stupid.

58、I went there in 1984, and that was the only occasion when I( )the journey in exactly two days.

57、Because fuel supplies are finite and many people are wasteful, we will have to install( ) solar heating device in our home.

56、( )conscious of my moral obligations as a citizen.

55、James has just arrived, but I didn't know he( )until yesterday.

54、His remarks were( )annoy everybody at the meeting.

53、( ), Mr. Wells is scarcely in sympathy with the working class.

52、If you explained the situation to your solicitor, he( )able to advise you much better than I can.