The front door ________ open．I'll have it repaired．
| A．mustn't | B．shouldn't | C．may not | D．won't |
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 |
We can broaden our horizons through _________ to new things.
| A．hazard | B．exposure | C．recreation | D．vapor |
Jack’s house has been broken into twice and now he takes________ against theft
at any time.
| A．risks | B．chances | C．turns | D．precautions |
The environmental organization calls on customers not to purchase these _______ packages of food, clothes and gifts.
| A．intrusive | B．cognitive |
| C．excessive | D．sensitive |
People are advised not to smoke at home, since passive smoking is ________ topeople around them. Which is Not proper for the blank?
| A．dangerous | B．protective |
| C．hazardous | D．risky |