57.which of the italicized parts functions as a subject? ( )

53. The party, ( )I was the guest of honour, was extremely enjoyable.A by whichB for whichC to which D at which

52. If only I ( ) play the guitar as well as you!

51. ( )dull he may be, he is certainly a very successful top executive.

81、This spacious room is( )furnished with just a few articles in it.

80、The priest made the( )of the cross when he entered the church.

79、Since the early nineties, the trend in most businesses has been toward on-demand, always- available products and services that suit the customer's( )rather than the company's.

78、Mr. Brown's condition looks very serious and it is doubtful if he will( ).

77、Taking photographs is strictly( )here, as it may damage the precious cave paintings.

76、The heat in summer is no less( )here in this mountain region.

75、The president explained that the purpose of taxation was to( )government spending.