Помогите пожалуйста,очень срочно must or may.

1. Do you know if David is at home? - He ... be in his office but I am not sure. 2. Are they British? - Yes, they ... be British. 3. That dress you bought yesterday is very good quality. It... be very expensive. 4. Where's Ann? - I don't know. She ... be at the library. She sometimes goes there after classes. 5. He's got a few cars, a yacht and a helicopter. He ... be very rich. 6. Do you know if Ann likes ice-cream? - She... but I am not sure. 7. Dave isn't answering the phone. He ... be out. 8.1 had my keys a moment ago. They ... be here somewhere. 9. Is that a famous person over there in the middle of that crowd? - Yes, it... be. Everyone's trying to get her autograph. 10. Have you heard anything from Edd? Is he still in Africa? - He ... be, or he ... be already on his way home. I'm just not sure. 11.1 hear Laura has been offered a job at a top computer firm. - That's wonderful. She ... very pleased. 12. Is that volcano dormant or active? - Active.

According to experts, it... erupt again in the very near future. I з Ve ought to call before we drop in on Peter and Mary. They -•• busy. 14.1 hear Joe has received a scholarship and will be able to attend the university. - Wonderful. He ... be very happy to have the matter finally settled. 15. Isn't Margaret's daughter over 16?- She ... be. I saw her driving car, and you have to be at least 16 to get a driver's licence. 16. It can't be true. It ... be a lie. 17. This dog ... belong to Harry. It's got his address on its collar. 18. Where is Paula? - She ... be in the garden. I remember Father asking her to help him.