Знатоки английского языка! Прошу вас помочь

18 с
19 а
20 с

1. I bought this book yesterday.
2. I had seen this film before.
3. Have you ever been in Washington DC? Yes
4. We traveled in Europe last summer.
11. I am still not knowing that to do. I have not solved.
12. What are you reading now? I am reading Tom's book.
13. Who was talking on the phone at five o'clock in the evening?
14. Does he often go shopping? Yes, he goes shopping every day.
15. He had not eaten nothing since the morning.

Exersise 2.
1. She left the room at 6 o'clock suddenly.
2. They have bought a lovely two-storey house in London.