81.  On sports day, May be using 650 calories an hour.

82.  Some May be black or white, some May be yellow or brown, some are black and white.

83.  Best off all, we May working outside while studying.

84.  Usually we May wacting TV at 7 o'clock news , or we need to reading newspaper everyday.

85.  College student May getting to know the world outside the campus.

86.  Second, we May take oursevle into the world outside the campus.

87.  On the other hand, we May join all kinds of social ativities , this is the direct way we know the society better .

88.  Social practice May combinat with theory what we have learned, help us learn real knowledge.

89.  We also May take part in sociatist serves .

90.  Many people argue that there are so many rivers and wells in the world that human beings May have a plenty of fresh water to use.