Английский. Past Indefinite or Past Continuous.

1 I was sitting on the bench for half an hour and then began reading a book.
2 Did you see him this morning? – Yes. He was standing in the hall laughing.
3 He came in and saw Nelly who was drawing a strange picture.
4 I did not understand what Mr. Green was doing.
5 Nick and Fred were driving along the road when the accident happened.
6 When I came in, she was setting the table.
7 The businessman flew to England yesterday.
8 I did not hear what he said. I was typing at the moment.
9 When did it happen? – It happened when you were talking to your secretary.
10 We were walking in silence for 5 minutes, then he spoke.
11 I told him he should not read while he was eating.
12 The mouse was hiding while the cat was watching.
13 The train struck an obstacle on the line, but it did not stop because it was travelling too fast at the time.
14 I was sitting in my garden yesterday, when the servant came and said that a visitor was waiting for me in the hall.
15 He did not like to play while others were working.
16 Sorry, what did you say? I was not listening.
17 Did you enjoy your game of tennis? – No, I did not play as it was raining.
18 Why did you tell Ann her lessons were boring? – I did not mean it. I was only joking.
19 Why did you make so many mistakes in the last test? – I was thinking about my boyfriend.
20 Just imagine! I was waiting for you for an hour yesterday and you were sleeping at that very time.