A)根据句子意思，用括号中所给单词的正确形式填空。

43. He will move to a quiet town for             (safe).

44. If someone does not show good manners to others, he is              (polite).

45. London used to be             (fog).

46. Do you mind              (tell) me how to use this function?

47. I felt very happy when I was              (choose) to be the host.

48. This is such an interesting'book that it is worth _______________ a second time.