80． These days she was very busy. She o_______ herself in writing 5 English reports.

79． The student is excellent in t______ of study, but he has his character shortcomings.

78． S_______ by the Revolution in 1789, France became a different country afterwards, and today, it is still guided by those principles.

77．The infrastructure of a country is what makes everything run s_______, including things like transport, electricity, telephones and so on.

76．This is a small town l_______ 30 miles south of Chicago.

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?