The key answer of exercise 3

a)

1. Dubai is more expensive than Bangkok.
2. Bangkok is the most crowded of the three destinations.
3. Vienna is easier to get to than Bangkok.
4. Bangkok is more exciting than Dubai.
5. Dubai is hotter than Vienna.
6. Vienna is the most relaxing of the three destinations.

b)

1. as
2. than
3. the
4. more
5. worst
6. less
7. quicker / faster
8. most
9. as
10. least

c)

1. isn't as big as
2. walk faster than
3. the most interesting city
4. is less interesting than
5. the best pizza
6. isn't as expected as
7. is the same as
8. the least comfortable bed