根据句子意思，用括号中所给汉语提示或英语单词的适当形式填空。(每空一词)

46. ________ the citizens with all kinds of vegetables is a great task for the company. (服务) 

47. Look at the sign！We are not ________ to park cars here. (允许)

48. Did you hear someone ________ at the door when you were doing your homework? (敲击)

49. The tourists had no ________ but to wait for the next train. (选择)

50. I want to buy some new ________ for my new flat. (家具)

51. The best time to visit Ge Garden is from the mid-April to the ________ of May. (begin)

52. What an _________ journey they had the day before yesterday! (enjoy)

53. I changed into my sports shoes so that I could walk more ________ (comfortable).

54. --- Can you tell me the time of her _________?  ---It’s on May the twentieth. (arrive)

55. My grandma is in her ________, but she can still take care of herself. (eighty)