Заполните пропуски. When I was driving home, I ... a friend at the bus stop.

The correct answer is 'saw'. The sentence describes a completed action in the past ('driving home') when another action occurred ('seeing a friend'). The simple past tense 'saw' fits this context. 'was seeing' suggests a continuous action, which doesn't fit, and 'have seen' is present perfect tense, not suitable for a past time event. The complete sentence should read: 'When I was driving home, I saw a friend at the bus stop.' Answer options explanation: - saw: Correct - was seeing: Incorrect - have seen: Incorrect