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Not at all Yes, of course You’d better not That’s all right
Too much air Not enough fresh air Too much sleep
Not at all. Why not? Never min D.What of it?
Not at all Yes, of course You’d better not That’s all right.
Never mind You’d better not That’s all right Not at all
Never mind You’d better not That’s all right Not at all
is it does it isn’t it doesn’t it
the fresh air can’t come into the house there is only a little fresh air coming in and a little waste going out the air in the house can’t remain fresh the house gives off wastes
to describe how a company can go bankrupt to emphasize the urgent need of cleaning up the environment to stress the importance of the government’s role in preventing pollution to tell how difficult it is to keep the environment free from air-pollution
You’re welcome Not at all Don’t mention it That’s all right
manufacturers will not take care of pollution control on their own will few manufacturers are aware of the importance of air-pollution control air-pollution control devices are more expensive than other devices people like to buy cars that are equipped with pollution control devices
catch plates dampers regulating valves fans
canister-type gas mask fresh-air breathing apparatus self-contained breathing apparatus combustible gas indicator
is it does it isn’t it doesn’t it
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