Much attention should be paid _________people’s living conditions.

—Why does the lake smell terrible? —Because large quantities of water _____.

If the project ________ by the end of this month is delayed , the company is sure to pay a large sum of money for it .

Many people prefer large cars, __________________large cars are safer than small ones. 

In New England, I made lots of friends ______ a very practical knowledge of the English language.