The key answer of exercise 6

a)

1. In her late twenties, to continue her studies.
2. She missed Colombian food. There are lots of special dishes. In Colombia, people take their time preparing food. People say Colombians cook with love.
3. She tried food from many countries (Libya, Poland, Tunisia, Peru and Japan). Other international students made it.

b)

The first example has three short sentences that don't connect together very well. In the second example, the three short sentences are linked with when. This makes it flow more smoothly, and easier for the reader to understand.

c)

I missed my family and friends. I also missed Colombian food. It was wonderful and I tasted food from many countries: Libya, Poland, Tunisia, Peru, and Japan. I also made many good friends.