Exercise 2:
1, Ann was writing a letter in the room when I came in.
2, George gets ready to go out when he has free time.
3, Carol and Dannis were having lunch when we arrived.
4, Tom was making a phone call while Sally was doing exercises.
5, It began to rain when I was walking home.
6, He sat down on a chair when I was painting the door.
7, He was running for a bus when he collided with a post.
8, His chair caught fire when he was cooking chips.
9, He was holding a beautiful vase when he dropped it.
10, He was sitting in the garden when a bee stung him on his nose.
Exercise 3:
1, stayed
2, did
3, decided
4, went
5, turned on
6, was filling up
7, went
8, was lying
9, fell
10, was sailing
11, came
12, made
13, was struggling
14, woke up
15, heard
16, came
17, realized
18, jumped off
19, ran
20, was