11.  Michele Posey is a treasury analyst in Chicago who has recently returned to public transportation as her primary means of commuting.

12.  Most of these jobs do not pay much, and these people often depend on Social Security as their primary means of support in retirement.

13.  No longer a primary means of transportation, the graceful high-prowed gondola is still a symbol of Venice and a common sight in the city.

14.  Railroads are also the primary means of long-distance travel for most of the population, since China has yet to complete a national network of long-distance, high-speed highways.

15.  Regular physical activity is my primary means of coping with the stresses of modern life.

16.  Scientists have long understood that animals use pheromones as a primary means of communication.

17.  So growing businesses are the primary means of generating wealth.

18.  Such distance measurements are the primary means of estimating the rate at which the universe is expanding, and thus estimating its age.

19.  The human drug is the primary means of treating salmonella in children, whose less developed immune systems often have a hard time fighting it off.

20.  The new IOD, however, uses illustrations as a primary means of defining some words.