Read the text and fill the gaps using the correct variant a, b, c or d camping although (0) a some groups of people have always lived outdoors in tents, camping as we know it today began to be 15) about 50 years ago. the increase of the use of cars and improvements in camping have allowed more people to travel longer distances into the countryside and to stay there in greater comfort. many campers like to be 17) themselves in quiet areas, so they 18) their tents and food and walk or cycle into the forest or the mountains. others, preferring to be near people, drive to a public or privatelyowned campsite 19) has up-to-date facilities, like hot showers and swimming pools. whether campers alone in the mountains or on a busy site, they should remember to leave the area clean and tidy. in the forests, they must put out any fires and keep food hidden to avoid attracting animals. 0 a some b every c both d each 15 a familiar b popular c lovely d current 16 a bags b luggage c equipment d property 17 a on b by c at d of 18 a take b make c do d give 19 a where b who c which d when 20 a wild b natural c loose d free