81.  Its trunk is very slim and there're sparse leaves on it.

82.  The other is that its style is dull and lacking of force.

83.  If pop songs' weaknesses would be corrected and its advantges would be developed, it is possible for pop songs to be acepted by traditional musician .

84.  Generally speaking, the advantage of sports is much more than its disadvantge .

85.  Therefore money has its evil side.

86.  Almost every people can take train, but few people take plane because of its high expense.

87.  I think the activity has its profies .

88.  Athough , the selling in the school had its profits, we must make it clear in our mind that the activity must be controlled by the school.

89.  Its area is about half of a square kilomater .

90.  In order to solve the problem of vacabulary you should read more English articles and impress the new word including its meaning in your mind.