Exercise 1

1. One day

2. later

3. Soon

4. Then

5. By then

6. in the end

Exercise 3

1. One day

2. In the end

3. By then

4. the past simple

Exercise 4

1. Soon she was tired so she sat down to have a rest. / She was soon tired so she sat down to have a rest.

2. Sam didn't want to go on the trip, but in the end he enjoyed it. / Sam didn't want to go on th e trip, but he enjoyed t in the end.

3. By then I was feeling hungry because it was lunchtime. / I was feeling hungry by then because it was lunchtime.

4. It went cloudy and then it started raining. / It went cloudy and it then started raining.