52. Zhang Yining is one of the best 　　 (athlete) in the world.

51. Please tell us where 　　 (go) tomorrow.

50. They should 　　(尽最大努力) to learn the language well.

　　 B. 用所给单词的适当形式填空。

49. A butterfly is flying 　　(上上下下) among the flowers.

48. The basketball team had the most 　　 (胜利) last season.

47. The little girl 　　 (能) sing songs at the age of 3.

　 A. 根据句意及汉语提示，写出单词或短语。

46. Tomorrow is her 　　 (第二十个) birthday.