_____ of the students who took part in the military training is 450.
| A．A number | B．A lot | C．Lots | D．The number |
—I wonder what makes you a great teacher?
—I _______ as a tutor in my spare time at college, which contributes much to my today’s job.
| A．work | B．have worked |
| C．had worked | D．worked |
Generally speaking, there are four essential factors _______ Chinese cooking is usually judged, namely, color, shape, smell and taste.
| A．that | B．with wich |
| C．where | D．by which |
A government spokesperson on Friday called for China's 500 million Internet users to _______ unconfirmed online rumors(谣言).
| A．boycott | B．promote |
| C．advocate | D．separate |
The deadly Ebola virus disease is different from flu, _______ they have some similar outward symptoms, such as fever and headache.
| A．since | B．as |
| C．though | D．unlsess |
It can't be denied that Taiwan is _______ part of China, and any other counrty does not have _______ say in this issue.
| A．a; a | B．a; the |
| C．/; a | D．a; / |