Дополните предложения словами must, can039;t/couldn039;t и запишите глаголы в скобках в

Дополните предложения словами must, can't/couldn't и запишите глаголы в скобках в правильной форме.
1. I phoned them last night but no one answered. They _ (be) out.
2. You _ (see) her at the station - she was at home with me!
4. What happened to sentence 3? They _ (forget) about it!
5. He lost his job and then his father died - it _ (be) an easy time for him.
6. You're going out with Victor? You _ (be) serious! In fact, you _ (be) mad!
7. He _ (be) hungry - he's just had lunch!