73.Your understanding of the theory issatisfactory . You must read more after class.

67.A friend of mine returned to his house after a holiday, only to find it.

66.The managera rise in salary for ages, but nothing has happened yet.

65.You the difficulties after I explain the whole thing to you.

64.We on the isolated island for thirty hours when the rescue team finally came.

63.Despite the previous three rounds of talks, no agreement so far by the two groups.

62.We are glad that a subway very soon in our city.

61.Mrs. Smith often some shopping at weekends last year.

60.Which one of his books do you think best among the best-sellers?

59.I my experiment report all the morning and haven＇t finished yet.

58.If nothing, the ocean will disappear gradually.