[单项选择]This isn't a practice game; we are playing for real. The underlined part means ______.
A. seriously
B. for money
C. for fun
D. thoroughly

[单项选择]We have sent an order slip to all that we have reason to believe are interested in our books.（　）
A. who are believed by us
B. with who we have reason to believe
C. who we have reason to believe
D. with whom we believe

[单项选择]______ there is little we can do to change the reality, we can not be totally at the mercy of the harsh environment.
A. Since
B. When
C. Unless
D. While

[单项选择]

Passage Two
A hundred years ago, the game we now call football did not exist. American football started during a game between two colleges. The teams had got together to play what they called "football", but each team played by different rules. One team played what we now call soccer. The other played what we now call rugby (橄榄球).
Both games had been invented a thousand years before. In the first kind of football game ever played, all the men from one village tried to kick a ball into another village. The men of the second village tried to kick the ball into the first. Hundreds of people joined in, running everywhere, running crops and knocking down fences. In time, people agreed on some rules to keep order, but many roles were left open to change. Different rules developed in different places.
When the two colleges met to play football, each followed its own rules. They mixed the games together and invented a new game. A hundred years lat
A. American football might develop in different places.
B. American football is supposed to be changeable.
C. American football will have its own rules.
D. American football might see changes in the years to com