Smoking is one of the ______ of heart disease and it kills lots of people every year.
| A．causes | B．reasons | C．excuses | D．results |
The conference the_____ possibility of closer trade links.
| A．rejected | B．investigated | C．proposed | D．postponed |
She has been the subject of_____ media coverage.
| A．massive | B．negative | C．expensive | D．active |
The Klondike was the_____ of one of the biggest gold rushes the world has ever known.
| A．scene | B．view | C．event | D．landscape |
We have to ask them to ____talking in order that all people present could hear us clearly.
| A．decrease | B．quit | C．continue | D．keep |
Because _____ the whole company, he sometimes has to work around the clock.
| A．adjusting | B．evaluating | C．engaging | D．managing |