We will have no water to drink ________ we don't protect the earth.
-The young man who entered our factory last month has made some mistakes this week. --Well.____.
Ladies or gentlemen,whether young or old,____ some money of yours to the poor people in the mountain area who are suffering.
--How do you like this piece of music by Tan Dun? --Well,of all the music that he has written,I think this is his ____ one.
--This kind of sports is exciting. --Yes,but it's dangerous.One can't do it ____ he or she has got some training.
--Could you tell me ____? --Until tomorrow afternoon.