.Miss Li ________ as a biology teacher for fifteen years in our school, and now she is Party secretary of our city.
.Three-fourths of the buildings ______.
Mary is one of the girls who ______ always on time.
It was so cold that they kept the fire ______ all night.
. Some of the doctors are paid almost ______ as the nurses.
.We should try our best to ______ those people after the disaster.