=>
III/
1. were waiting/arived
2. was swimmng/saw
3. Were they playing/started
4. cried/heard
5. were driving/stopped
6. became/began
7. Mờ
8. were working /met
9. felt/mờ
10. was raining/got up
II/
1. fell/was riding
2. had/mờ
3. had/was still raining
4. lost/was wlaking
5. rang/mờ
6. were arguing/came
7. were still eating/arrived