49.Mrs. Green became a teacher in 2000. She will（ ）for twenty years by next summer.

76.It is a（ ）truth that man is the only animal that has the power to speak and reason.

75.The rebuilding plan was（ ）to the committee.

74.The（ ）between the two playing periods of a football game is only a few minutes.

73.The question then（ ）: What are we going to do when we graduate from the university?

72.There are two governments in this country. But neither of them is regarded as the（ ）one by the other.

71.The wounded soldiers’ blood（ ）the ground red at the front.

70.How can we finish the work in the（ ）of any other helpers?

69.Since 1978, many new（ ）have been developed in our university to meet the increasing demands of the students.

68.If there is no other way to save a（ ）person in a tall building on fire, fire fighters may spread a net into which the person can jump.

67.In the film we saw last night, the hero（ ）his wife to death with his sword.