Researchers claim to have found the first proof _______ getting a regular eight hours a night really does make you appear healthier and more attractive. 

There are fewer teaching positions left in big cities, ______ at the same time there are shortages of teachers in small towns．   

The young woman got to the cinema two hours ahead of time ________ she could get a good position.

Schools in the north tend to be better equipped, ______ those in the south are relatively poor. 

 I believe _____ you have made efforts and ______ you are sure to achieve your goal.