28. Dr. Frank failed many times but he finally _____ to find a successful way to solve the problem.
| A．broke off | B．broke up | C．broke down | D．broke through |
7. The questionnaire takes ten to fifteen minutes to complete and can be used along with the assessment interview.
| A．mainly | B．punctually | C．approximately | D．precisely |
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 |