The key answer of exercise 9

Rewrite sentences 1-7 using the infinitive of purpose, but don't change the meaning.

1. People go to the gym because they want to keep fit.
2. People shop online because they want to find the cheapest price.
3. People take taxis because it saves time.
4. In the future, more people are going to cycle to work because they want to do more exercise.
5. People grew vegetables at home in the past because they needed to feed their families.
6. People are going to learn more foreign languages in the future because it helps them find a job more easily.
7. In the past, people moved to the city becausethey wanted to find a job.