71.  L: Sure, I am glad to answer your questions.

72.  It is sure that there exists some fields where its own knowledge is sufficient to pose a series of exciting discoveries, but we must see the strong power of the combined subjects.

73.  If there's someone(except our boyfriend or girlfriend), who lives in our heart wherever we go and whatever we do, he or she is sure our best friend.

74.  You may smile and answer without hesitation, "Sure, I do! "

75.  Firstly, as we all know, the development of Internet T echnology is sure a necessary condition to education online.

76.  Professor: Yes , it is sure to worth.

77.  M: Yes, sure it is.

78.  On account of that people in the world are various, we are not sure that whether the man we face to kind or evil.

79.  So, when I make friends, I should first of all make sure whether they are honest or selfish.

80.  No one can make sure if it is favourable for the field of study.