Ответ:

1) London has a wide variety of shops that cater to different tastes and budgets. There are high-end luxury stores, independent boutiques, department stores, and popular high-street chains.

2) Young people in London often like to shop at trendy fashion stores, vintage clothing shops, and urban streetwear outlets.

3) It's not clear from the given information whether Christie has bought any presents for her friends in Ukraine.

4) The location of the girls on Saturday is not provided in the given information.

5) There is no description of the place in the given information, so it's impossible to answer this question.

6) It's not clear from the given information whether Mary has bought any clothes.

7) There is no indication in the given information whether Mary likes shopping in London or not.

8) Christie calls London a paradise for shoppers because of the wide variety of shops available, from high-end luxury stores to independent boutiques and popular high-street chains, as well as the fact that it caters to different tastes and budgets.