In recent years, travel and tourism have developed significantly and become very important to millions of people all over the world. It may bring in earnings, create jobs for many people and improve their life as a whole. For instance, in every country you can find people (26) ___________ jobs in travel and tourism. Some countries need the money from tourism to help their people survive. It's necessary for these places that travel and tourism continue to expand and bring money to their regions. However, travel and tourism have (27) ___________ effects. Means of transportation such as planes, buses and boats that carry travelers and tourists cause pollution. (28) ___________, some people do things on a holiday they would never think of doing at home. For example, many travelers use too much water and electricity when they stay in hotels. They forget to switch off the lights and even leave televisions and air conditioning units (29) ___________ when they leave the room. Above all, it is often difficult or impossible for travelers to recycle items, so they end up leaving large amounts of waste behind. That's why it is important for people to travel wisely and respect the places (30) ___________ they visit.

Read the following passage and choose the word or phrase (A, B, C or D) which best fits each of the numbered blanks.

For instance, in every country you can find people (26) ___________ jobs in travel and tourism.