Choose the most suitable word for each space.

Air-travel is the most modern form of (34) transport and it (35) in the 20th century. Millions of people use airplanes for a variety of reasons. It is also extremely expensive to (36) air-travel facilities. Some travel for business, others go on holiday (37) air and others use cargo planes to move their products from country to country very (38) . Some courier companies now have their own fleet of planes ready to carry parcels and post more efficiently. There are different types of passenger services - some are cheap and provide a ‘no-frills’ service which is good for short journeys. Other airlines (39) passengers with a luxurious flying experience. Airports are getting busier and it is evident that (40) passengers and businesses than ever are using airplanes to get to their destinations.

Read the passage and choose the best answer.

EARTH HOUR
Earth Hour is an annual event that asks you to switch off all your lights for one hour. The aim is to involve as many people as possible in positive change for our planet.
What is Earth Hour?
Earth Hour is organised by the World Wide Fund for Nature (WWF) and it’s a big event usually at the end of March every year. On the evening, people ‘go dark’ - that is, switch off lights in their homes, schools and businesses all at the same time for one hour. Earth Hour started in Australia in 2007, when 2.2 million people in Sydney turned off all unnecessary lights for an hour. Since then, it has grown into an international event, and many countries around the world have taken part. Famous buildings that have gone dark for Earth Hour include the Sydney Opera House and Harbour Bridge, the Petronas Towers in Kuala Lumpur, the Houses of Parliament and Buckingham Palace in London, Eiffel Tower in Paris, the Forbidden City in Beijing and New York’s Empire State Building.
What’s the idea behind Earth Hour?
The idea is to raise awareness of environmental issues and call for action to protect nature, so that people enjoy healthy, happy and sustainable lives now and in the future. It's true that switching oft' the lights for just one hour saves only a small amount of power. But this is only the beginning. On one level, joining in Earth Hour makes people think about the problem of climate change and what we can do in everyday life to protect nature.
What does ‘60+’ mean?
The logo of Earth Hour is ‘60+’. The number 60 is for the 60 minutes of Earth Hour, and the plus invites people to keep on taking action even after Earth Hour is finished. In fact, people who join Earth Hour say that taking part makes them want to do more for the environment. The climate activist Greta Thunberg says that ‘Earth Hour is every hour of every day.’