Choose the correct option?

Choose the correct option. Underline ‘when’ or ‘while’. 1. Susan was writing a letter when / while Peter was reading the report. 2. Mark was driving a car when / while he had a car accident. 3. When / While I was cooking dinner, I burned my hand. 4. Sharon found money when / while she was walking in the park. 5. Eduardo was washing his car when / while John arrived.