请认真阅读下面各题，从题中所给的A、B、C、D四个选项中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
21. While he was investigating ways to improve the telescope, Newton made ________ discovery which completely changed ________ man’s understanding of color.
A. a; ／ B. a; the C. ／; the D. t he；a
22. In many states of America, a neighbor may ______ you with playing your radio too loudly.
A. charge B. blame C. punish D. scold
23. It was July 24th when he arrived in London, ______ the 30th Olympic Games would be declared open 3 days later.
A. that B. how C. where D. Who
24．—Can I ask for a leave tomorrow．Mrs. Harmon?
— You've missed half of the lessons already．_.
A．That all depends B．Forget it C．Never mind D．Don't worry
25．— Did they attend the opening ceremony?
—They _, but they were late and quit it．
A．would B．would have C．didn't D．will have to
26．Because of his achievement in the field, Mr．Young is _ as an example of a man who works hard and manages to live his dream．
A．lived up to B．looked up to C．stood up to D．followed up to
27．—Do you want tea or coffee?
