Complete the crossword, then click on "Check" to check your answer. If you are stuck, you can click on "Hint" to get a free letter. Click on a number in the grid to see the clue or clues for that number.

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Across: 1. Recent studies suggest that [_______________] factors, rather than heredity, play the major role in whether or not a person develops most types of cancer. 3. We need to find a more [_______________] way to manufacture our products because our profit margin is too low. 4. My daughter is studying the [_______________] of algebra at school these days. 7. Lester Bangs once remarked that the first mistake of Art is to [_______________] that it's serious. 10. The Canadian province of Nova Scotia leads the world in [_______________] lobster, wild blueberries, and Christmas trees. 12. We need to [_______________] our emergency procedures. Someone could have died in the accident and no one knew what to do. 15. My father's company has been experiencing some [_______________] difficulties, so they are going to have to lay off some staff. 16. People like to be [_______________] in decisions that affect them. 17. Living in Berlin during the [_____________] when the Berlin Wall was torn down was an unforgettable experience. 18. Jews in South Africa contributed proportionally more men to the war effort in World War Two than any other [_______________] of the population.

Down: 2. Our market [_______________] are responsible for getting feedback from potential customers before a new product is released. 5. Our chief [_______________] of fresh water is the rainfall that collects in lakes and rivers. 6. By [_______________] DNA from people in all regions of the world, it has been determined that all humans alive today are descended from a single man who lived in Africa around 60,000 years ago. 8. For dessert, we had [_______________] of mandarin oranges dipped in melted chocolate. 9. He did an [_______________] of the way children learn language for his Master's thesis. 11. Attention passengers on flight 514 to Honolulu. Please [_______________] to gate 33 where you plane is now boarding. 13. There often seems to be a conflict between management and [_______________] in the North American industrial model. 14. One's values should be viewed in the [_______________] of one's culture.