The former Olympic champion was ______ in the quarterfinals last night when he lost 0-2 at home.
| A．knocked off | B．knocked out | C．knocked down | D．knocked over |
6. As there is less and less coal and oil, scientists are exploring new ways of making use ofenergy, such as sunlight, wind and water for power and fuel.
| A．primary | B．alternative | C．instant | D．unique |
5. In our class, when the bell rang and the taacher closed his book, it was a or everyone to stand up.
| A．signal | B．chance | C．mark | D．measure |
4. Hiking by oneself can be fun and good for health. It may also be good forbuilding.
| A．respect | B．friendship | C．reputation | D．character |
3. Some parents are just too protective. They want to ______ their kids from every kind of danger, real or imagined.
| A．spot | B．dismiss | C．shelter | D．distinguish |
2. During the war there was a serious lack of food. It was not unusual that even the wealthy families had to ______bread for days.
| A．calculated | B．considered | C．completed | D．controled |