Put the verbs in brackets into the correct past tense. Justify your answers.
1. Paul......(break) his arm while he......(paint) the wall.
2. Sandra finally......(pass) the exam. She......(study) really hard for months.
3. A: How long......(Mary/work) here before she......(retire)?
B: More than twenty years.
4. While I......(walk) home last night, I......(bump) into Sally
5. The sun......(shine) and the birds......(sing) as we......(drive).
6. We......(finish) the main course and......(wait) for dessert when the fire alarm......(ring).