According to recent reports, one of the rare animals, _____ crocodile, will be in danger of dying out in _____ 2020s.
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 _____.
48. Some new changes happened _____ the school _____ my absence.
47. She was disappointed _____ hearing the news that Chinese football team lost the first match in “World Cup”.