The key answer of exercise 2

a)

1. It's a person who sells things to tourists.
2. It's an adjective which we use to say a place is not very lively or exciting.
3. It's a place where people go to buy flowers.
4. It's a person who cleans public places if they are dirty.
5. It's a word that means the opposite of 'dangerous'.
6. It's a place where you put rubbish.

b)

1. souvenir seller
2. dull
3. flower stall
4. street cleaner
5. safe
6. rubbish bin

c) -