Combine the two sentences using “when” or “while” where appropriate

Gap-fill exercise

Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!
1. They were cleaning the streets. It started to rain.
While , .
when .
2. I was watching TV. I saw the floods and landslides in the area.
While , .
when .
3. Tim was searching for employment opportunities. He found a job advert from a non-governmental organisation.
when .
While , .
4. They decided to help build a community centre for young people. They were visiting some poor villages.
when .
when .