Let's solve the exercises from the image:

### Left Column

1. My friend **was waiting** for the bus when I saw him.
2. Sue **was living** in France when her uncle **died**.
3. Nick **was cooking** dinner when the phone **rang**.
4. My mother **was cooking** dinner while my father **was reading** a book.
5. When you phoned, I **was having** a shower.
6. We **were watching** TV when my dad **came**.
7. Tom **was going** through the park when a dog **started** barking.
8. My father **was working** in the garden when our neighbor **called**.
9. They **got married** while they **were studying** at the university.
10. He **was driving** when the accident **happened**.
11. While I **was walking**, I saw Adam.
12. While I **was reading** a newspaper, my cat **was sleeping**.
13. Andy **met** Anna while he **was traveling** in Egypt.
14. Helen **broke** her leg while she **was skiing**.
15. While I **was shopping**, somebody **stole** my car.
16. When children went out, it **was raining**.
17. When I **saw** John, he **was shopping**.
18. When I walked in, children **were fighting**.

### Right Column

1. When I **heard** them, they **were speaking** English.
2. They **told** the police that they **were playing** football.
3. Adam **was listening** to music when Ben **dropped** the tray.
4. My mum **was making** a cake when the doorbell **rang**.
5. We **were walking** in the park when it **started** to rain.
6. Anna **was riding** her bike when she **hit** a tree.
7. My parents **were sleeping** when my brother **began** to play the drums.
8. John **was having** lunch when Tom **came**.
9. My mother **was planting** flowers when my little brother **jumped** on the tulips.
10. They **were having** a party when the lights **went** off.
11. I **was eating** when the spaceship **landed**.
12. Children **were playing** a game when I **came**.
13. We **were leaving** the party when he **arrived**.
14. Sally **was reading** a book when she **heard** the noise.
15. We **were having** dinner when Adam **visited** us.
16. She **was crossing** the road when she **saw** him.
17. I **was choosing** the present when my friend **came** in.