I don’t like it at all. It can’t be _____.
The open-air celebration has been put off __________ the bad weather.
__________ fire, all exits must be kept clear.
Some students often listen to music __________ classes to refresh themselves.
— __________ when has the country been open to international trade?— 1978, I suppose.
— I think he is taking an active part in social work.—I agree with you __________.