can't / be could / switch might not / be might /...

can't / be could / switch might not / be might / throw must / be must / leave must / miss

A: Oh no. A traffic jam. There must have been an accident.
B: It ______ an accident. I was once on a motorway and a lorry was on fire.
A: How did that happen?
B: I don't know. Someone ______ a cigarette from a bridge. It _____ a very big fire because the lorry was okay when we finally passed it but the road was closed for ages.
A: Where's Dan? He's late.
B: He _____ his bus. Why don't you phone him?
A: I tried but there's no answer. He _____ it at home.
B: Or he _____ it off. You know Dan. He switches it off in school and then forgets to switch it on again.

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