用must to 和have填空。 1. Lora ____________ wait for another three hours because the plane was late. 2. You _______ hurry. I’m sure you can arrive there in time. 3. — _______ I hand in the exercises today? — No, you needn’t. 4. Jenny can’t come to the party. She ______ help her mum do the housework. 5. When I was a child, I was told that I ____ not go swimming in the river alone.