51. In late autumn almost all the _________(leaf) turn yellow.

50. Mother is busy __________(准备) for the coming big dinner in the kitchen.

B)根据句子意思，用括号中所给单词的适当形式填空。

49. __________ (百) of workers in Libya(利比亚) returned to China successfully in March, 2011.

48. Go ______________(穿过) the bridge, and you can see the shopping mall on Fourth Street.

47. --- Susan, is this Millie’s sweater?

--- Oh, no. ______________(她的) is blue but this one is red.

A)根据括号中所给的汉语写出单词，使句子意思完整正确。

46. When we __________(到达) to the theatre last night, the performances had already started.