At times the balance in nature is ______ , resulting in a number of possibly unforeseen effects.
| A．troubled | B．confused | C．disturbed | D．puzzled |
Public service ads，also PSAs，often _________ for free，_________ to educate people about health，safety or any other problem that affects public welfare.
| A．run；meant | B．are run；are meant |
| C．are run；mean | D．run；are meant |
At the ancient Olympics，all men，________ had to compete wearing no clothes；while single women took part in their own separate competition，a festival _________Hera，the wife of Zeus.
| A．in tradition；in favor of |
| B．by principle；in celebration of |
| C．by tradition；in honor of |
| D．in order；in memory of |
--- Why do you think ________ the Eagles went home，angry and bitter？
---_________ they didn’t win the tournament andbecause what mattered to them was victory.
| A．was it that；That | B．that；For |
| C．it was that；Because | D．that；Because |
The small boat was almost sunk by the dinosaurs which suddenly ________ to the surface，fighting each other，but fortunately the three men ________ get away.
| A．rose；could |
| B．rose；were able to |
| C．arose；could have been able to |
| D．raised；could have |
_______the virtual world of RealCine，the headsets even have small openings _______ smells to match the environment.
| A．Adding to；give out | B．Added to；give off |
| C．To be added to；giving off | D．To add to；giving out |