I can help with completing the exercises based on common English usage. Here are the suggested answers for the exercises:

### Exercise 5: Choose the correct answers.
1. The British Prime Minister live in **Downing Street**.
2. One of the nicest parks in London is **St. James's Park**, which is very near **Buckingham Palace**.
3. Frank is a student at **Liverpool University**.
4. Mr. Jenkins reads **The Daily Telegraph** but his wife reads **The Times**.
5. We flew from London to **Orly Airport** in Paris.
6. Mary and Peter got married in **St. Matthew's Church**.
7. In Britain, **coffee** is more expensive than **tea**.
8. All over the world, people are in **prison** because of their political beliefs.
9. I only had **one** pizza - I didn't want three of them.
10. It only took **a week** to drive to Greece.
11. I've always wanted to own a **silver-coloured** car.
12. Policies differ from **one** state to another.
13. Less than three quarters of **the** hour later, she was home.
14. All of the competitors completed the race, with just one **exception**.
15. The best way to learn is by using a **musical instrument** to find.

### Exercise 8: Complete the paragraph with suitable articles.
I arrived in (1) **the** USA last Monday. We left (2) **for** London. There we went shopping at (3) **Harrods**, visited (4) **the** Tower and enjoyed a sunny afternoon in (5) **the** Hyde Park. On the way we left for (6) **New York**. The time on board wasn't boring as there were two films to watch on the monitor. The people on the plane were all (7) **Italian**. Before we landed at (8) **JFK** airport, we saw (9) **the** Statue of Liberty, (10) **Ellis Island** and (11) **the** Empire State Building. The hotel I stayed in was on the corner of (12) **42nd Street** and (13) **5th Avenue**. I don't like hotels very much, but I (14) **didn't** have time to rent an apartment.

Feel free to adjust any of the answers or ask for further clarification!