The story of Whitney Houston is a good example of how drugs and bad relationships can _______ even the most talented stars.
| A．murder | B．present | C．ruin | D．suspect |
The U.S. official said North Korea --- and Iran --- should follow in the steps of Libya, which last December said it would work__________ to allow international weapons inspectors to do their work.
| A．unconditionally | B．unwillingly | C．unfortunately | D．uncomfortably |
We have brought in a good grain harvest for three years_________.
| A．on purpose | B．on end | C．on duty | D．on watch |
The security judge was very _________ when she explained that the driving licence was necessary for her work .
| A．reasonable | B．natural | C．ridiculous | D．available |
His brother aims to be __________ of his parents by the time he is twenty.
| A．innocent | B．beneficial | C．invisible | D．independent |
With everything arranged properly, the project is surely to _________ smoothly as planned step by step.
| A．improve | B．increase | C．progress | D．occur |