题目内容：

Each year thousands of 1. (explore) and tourists visit the polar regions of the Arctic and Antarctica. But the increasing number of people travelling to the ends of the Earth’ can have a negative effect 2. fragile ecosystems. Should tourists 3. (allow) to visit polar regions?

About 40,000 tourists visit Antarctica each year, More than five million travel to the Arctic and sub-Arctic. Transporting tourists to the regions 4. (increase) ship and airplane traffic, adding to the risk of pollution, oil spills, and other 5. (environment) damage. Because the places where wildlife is accessible 6. (be) few in numbers, tourist traffic can become concentrated in specific areas, 7. (put) Arctic vegetation at risk.

Others say that access 8. these very special parts of the world should not be restricted to only researches and scientist. Polar tourism allows people to develop deep personal connections with polar regions. “Those 9. travel to the Arctic or Antarctica often become cheer leaders for supporting those places” Jim Sano, vice president for travel and 10. (conserve) at World Wildlife Fund, told TFK.