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01. The [main] source of summer jobs for young people in this area is tourism.

02. The population of Canada is [mainly] concentrated within a hundred miles or so of the American border.

03. The [main] tourist area of the city is around the Inner Harbor.

04. The [main] bedroom is just down the hall.

05. The audience was [mainly] made up of the elderly.

06. Your [main] problem at work is that you don't finish things properly.

07. When we visited a small town in Yugoslavia, the entertainment for people seemed to consist of walking up and down the [main] street, meeting friends, drinking and gossiping.

08. Poet John Donne wrote, "No man is an island, entire of itself; every man is a piece of the continent, a part of the [main]."

09. Bears are extremely short-sighted creatures, which means they live [mainly] in a world of scent and sound.

10. In its earliest days, kabuki players were [mainly] women, but beginning in 1629, women were banned from performing for about 250 years.

11. The world's first civilizations appeared around 5,000 B.C. near rivers. The [main] peoples were the Sumerians, Assyrians and Babylonians.

12. Chile is [mainly] located in the temperate zone south of the equator.

13. Tropical rainforests cover about 85% of the [main] island of Papua New Guinea.

14. A Chinese proverb notes that the [main] road is an easy way, but everyone loves the side streets.

15. A Sierra Leonean proverb observes that knowledge is not the [main] thing, but deeds.

16. Blood is our body's [main] defense against germs.

17. Coffee, sugar, and bananas are the [main] products of Guatemala.