—Have you ever ridden a horse ?
—No, but I _____ a camel when I visited Egypt last year.
| A．was riding | B．have ridden | C．rode | D．had ridden |
We should take effective measures to the infectious disease.
| A．work out | B．stamp out | C．turn out | D．carry out |
Since Tom downloaded a virus into his computer, he cannot open the file now.
| A．constantly | B．accidentally |
| C．deadly | D．Eventually |
If you are from doing something, you are officially prevented from doing it.
| A．seeped | B．dispersed | C．bombarded | D．Banned |
The school offers many _____ activities for the local students.
| A．infectious | B．recreational |
| C．fragile | D．Vocational |
It is ______ that the noise around us is a(n) _______ to our health and well being.
| A．preventable; precaution | B．denial; existence |
| C．undeniable; hazard | D．vital; culprit |