52. We have finished __________ (装饰) the house.

51. Please discuss the question in _________ (组) of four.

50. He was _____ (能) to swim in the swimming pool at the age of five.

49. The boy was too __________ (惊恐) to move.

48. Would you please turn d______ the radio?

47. Father Christmas is b_______ on a real person in history.

46. E-mailing is much c_____ than long-distance calling.