While Marcos _____ around his garden, he _____ his bike. was cycling; fallen off /cycled; fell down /was cycling; fell off

While David _____ , he _____ down and _____ his head. was running; fell; hitted / was running; has fallen; hit / was running; fell; hit/ was running; was falling; hitted

We _____ an accident while we _____ the roof. had; were repairing have / were repairing ;were having/ repaired; have / had; repaired