Grammar: Multiple Choice - 2021 tavaszi

Fire and water don't mix. Everyone knows that. (0) ______ there is a mysterious and magical place in western New York State where the laws of nature (10) ______ and visitors can see a small flame burning brightly in a waterfall. Eternal Flame Falls continues to surprise geologists with its continuous flame. The waterfall itself, part of Chestnut Ridge Park, is not very (11) ______ . At the base of the waterfall, (12) ______ , there is a small cave. Natural gas seeps through a crack in the rock, fuelling the eternal flame, (13) ______ shines brightly through the water. According to local legends, a Native American lit the flame long ago and it has burned (14) ______ . That is not entirely true. Occasionally the flame is extinguished and (15) ______ to be re-lit with a lighter. There are other eternal flames around the world, so scientists (16) ______ that the fire at Eternal Flame Falls was the result of the same process. In the other eternal flames, the temperature of the rock beneath the flame is hot – at or exceeding the boiling point of water. The heat breaks down the carbon molecules in the rock, releasing natural gas. But at Eternal Flame Falls, the rock beneath the flame is much cooler. (17) ______ , the gas keeps coming. Geologists are researching the natural processes at work at Eternal Flame Falls. They believe that if they understand (18) ______ the gas is released at cooler temperatures, it will help them to find ways to extract natural gas from the rock in a safe and non-invasive way.