About ____ of the teachers in our school ____ young people under thirty.
| A．two-five, are | B．second-fifth, is | C．two-fifths, are | D．two-fifth, is |
32．My parents send me to a school _____ rules are just as important a part of education as the academic subjects．
| A．that | B．which | C．where | D．When |
31．—Can you tell me what time the flight to Detroit leaves?
—I'm sorry, but it ______．
| A．has been canceled | B．had been canceled |
| C．has canceled | D．had canceled |
30．Napoleon would have taken over the world if he ______ the Battle of Waterloo．
| A．wins | B．won | C．had won | D．has won |
29．—How did he break his head while swimming?
—______ my warnings, he dived straight into the shallow water．
| A．To ignore | B．Ignored | C．Ignoring | D．Being ignored |
28．You ______ very fast if you went from New York to Boston in six hours．
| A．should drive | B．would have driven |
| C．may drive | D．must have driven |