Read the text and choose the correct answer A, B, C, or D for each of the gaps.
EARTHWATCH
Have you ever wanted to do something different? Five years ago, Will Slade read about (17) ______ organization called Earthwatch. Earthwatch finds volunteers (18) ______ expeditions (19) ______ and explore different parts of the world.
Will decided (20) ______ an expedition to study elephants in Africa. "I wasn't sure about it before I went." say Will. "But in fact, I really enjoyed every minute of the expedition. We slept (21) ______ tents and we cooked our own food, but it was the great (22) ______ elephants and all the other animals there". "I've (23) ______ all the expeditions, and I have seen some fantastic places. How (24) ______ people have slept (25) ______ a beach, climbed a mountain, or see a whale? This world is such a beautiful place, but it's disappearing fast. We have to learn more (26) ______ it if we are going to save it."
(17).........................
