21. Urban crowdedness would be greatly relieved if fares ______ on public transport were more reasonable.
A. offered B. spent C. paid D. charged
22. These articles______ the problems of the modern world, including race relations and community development.
A. address B. avoid C. create D. correct
23. Wage increases to a certain level will probably help to ______ the average consumers from the effects of higher prices.
A. cushion B. reduce C. prevent D. remove
24. The workers agreed to ______ the strike if the company would satisfy their demands for better salaries and working conditions.
A. call for B. call in C. call off D. call up
