59．The old couple will take a one day ________(旅行).

58．One of the branches is _________(触及,接触) the water.

57. Hearing the boy's story, the people present were in _________(完全) silent.

56. These bad _________(牙) should have pulled out earlier.

55. We'll have exams __________(今晚).

54. Chinese is our mother __________(语言).

53.My little son prefers _________(西红柿) to potatoes.

52．Show me the way to the _________-(洗手间) please.

51．All his troubles seemed to come ________(同时).

50．This is a mixture of the best ______(烟叶).