1. heard ... were speaking
2. told ... were playing
3. was listening ... dropped
4. was making ... rang
5. were walking ... started
6. was riding ... hit
7. were sleeping ... began
8. was having ... came
9. was planting ... jumped
10. were having ... went
11. was eating ... landed
12. were playing ... came
13. were leaving ... arrived
14. was reading ... heard
15. were having ... visited
16. was crossing ... saw
17. was choosing ... came
