Choose the correct words.
1. Perhaps some light exercise could / must relieve the pain.
2. He fell asleep at his desk! He might / must have been exhausted.
3. Ann isn’t here. She must / can’t have forgotten.
4. You don’t have to / shouldn’t exercise when you don’t feel well.
5. She’s walking to school. She might / can’t have missed the bus.
6. He can’t / could have gone home. He’s left his bag on the chair.
7. We mustn’t / don’t have to learn Chinese.
8. Tania’s in Spain. You must / could have seen someone else.
1) could
2) must
3) must
4) shouldn't
5) might
6) could
7) don't have to
8) must