There's no way of knowing why one man makes an important discoveryanother man, also intelligent, fails.
| A． | since | B． | if | C． | as | D． | while |
The headmaster has retired but no one knows who will________him in the post.
| A．follow | B．succeed |
| C．remove | D．achieve |
The weather is concerned with all of us because it________us so directly—what we wear，what we do，and even how we feel.
| A．moves | B．guides |
| C．affects | D．benefits |
Recently stock prices have been falling________because of the influence of the global financial crisis.
| A．sharply | B．absolutely |
| C．narrowly | D．universally |
With his attention________on his mobile phone，he didn’t notice his headteacher’s appearance.
| A．fixed | B．having fixed |
| C．fixing | D．to fix |
China’s labor supply will continue to rise，despite the fact that the workingage population________.
| A．has decrease | B．was decreasing |
| C．will be decreasing | D．is decreasing |