75．He glanced briefly towards her but there was no sign of _______(认出).

74．The ring is one of her most treasured _______(所有物).

73．Yesterday we learned a law _______(追溯) back to the 17th century.

72．What was it that ________(区别) her from her classmates?

71．A ______ (代表) from the “ Green Peace” is said to give a talk about protection of wild life tomorrow morning.