Read the passage and choose the correct answer to fill in each of the following blanks.
In the future, there might be new jobs for young people that we can't even think about today. Here are a few ideas. First, there could be more jobs related to space. It might be possible for people to travel to space for fun in 20 or 30 years, but not many people know how to work in space. Young people might learn how to work on spaceships (17) ________ for the first space tourists. Second, there might be (18) ________ jobs that involve a lot of physical work because robots could do those jobs. (19) ________, someone will still need to fix the robots when they stop working. This could be a good job for young people who like working with computers. Lastly, there might be more jobs where people take (20) ________. For example, young people might work as guides for very (21) ________ sports, like mountain biking or snowboarding.
