Traveling to beautiful places is one of life's great pleasures, and every year millions of people visit famous mountains, beaches, and historic cities. Tourism brings money to local people and helps them share their culture with visitors from all over the world. However, when too many tourists come to one place at the same time, they can also cause serious problems. For this reason, many communities are now trying to make their tourism more （ 1 ）.
Large crowds of visitors can damage the very places they have come to see. Footpaths in popular national parks become worn and muddy, and historic buildings are slowly harmed by the touch of thousands of hands. Too many tourists can also make daily life difficult for local people, （ 2 ） prices rise and the streets become crowded. Some towns have even had to limit the number of visitors allowed each day.
Sustainable tourism tries to solve these problems. The basic idea is to welcome visitors in a way that protects nature and respects the people who live there. （ 3 ）, some areas ask tourists to stay on marked paths, to hire local guides, and to buy food and crafts that are made nearby. In this way, travel can continue to bring joy and income without destroying the very places and cultures that make each destination special. In a few famous places, so many tourists arrived that local people found it hard to live there, and some even moved away. Sustainable tourism tries to make sure this does not happen, so that both visitors and residents can stay happy for many years to come.
（1） 正解 1. sustainable
段落全体が「観光客が多すぎる問題を解決する観光」の話。題名にもある「持続可能な（sustainable）」観光にする、が正解。
（2） 正解 1. because
「観光客が多すぎると地元の暮らしが困難になる」、その理由として「物価が上がり通りが混む」が続く。理由を表す because が正解。
（3） 正解 1. For example
空所の後で「決められた道を歩く・地元ガイドを雇う」など具体例が並ぶ。For example が正解。
beehive：蜂の巣
a place where bees live（ハチが住む場所）
bloom：花が咲く
to produce flowers（花をつける）
crowd：群衆
a large number of people in one place（一か所にいる大勢の人）
respect：尊重する
to treat someone or something with care（人や物を大切に扱う）
voyage：航海
a long journey by sea（海を行く長い旅）
trade：取引する
to buy and sell goods（品物を売り買いする）
tax：税金
money people must pay to the government（政府に払わなければならないお金）
protest：抗議する
to show strongly that you are against something（何かに強く反対だと示す）