—Could I speak to Miss Smith, please?—______. She’s gone to the post office.
53. Our music teacher often enjoyed _____ playing the violin in his spare time.
52. The struggle against sand storm will not end _____ victory unless we pay much attention to the balance of nature.
51. Don’t put your cell (手机) _____ the edge of the table, or it will fall off
50. The Englishman has a very good ear _____ music. You can ask him for some advice.
49. He goes _____ at 8 a.m. and comes _____ at 5 p.m. Today he is _____.