单选题：—I'm green at everything.—Don't worry.________you get ol..

The medicine works more effectively _________ you drink some hot water aftertaking it .[ ]A. asB. untilC. althoughD. if

There are fewer teaching positions left in big cities, ____ at the same time there are shortages of teachers insmall towns. [ ]A. or B. and C. so D. for

Find ways to praise your children often, _____ you'll find they will open their hearts to you. [ ]A. till B. or C. and D. but

________ high homelessness and unemployment rates, education is a top priority(优先地位) for many Haitians.[ ]A. Regardless B. DespiteC. In spite forD. Though

You have failed two tests. You'd better start working harder, _____ you won't pass the course. [ ]A. andB. so C. butD. or