ответьте на во с использованием must/may.
1. Why is he so pale? 2. Why did she return from the station? 3. Why did he fail at the examination? 4. Why did you put on your best clothes? 5. Why have you come here by bus? 6. Why did they spend the night in the open air? 7. Why did they give up their intention to travel? 8. Why was Helen looking at him in astonishment?