Помогите с модальными глаголами

1. You ... come in when you have taken off your boots. 2. Be careful: you ... spill the milk if you carry it like that. 3. Most children ... slide on the ice very well. 4. I don't think I ... be here by eleven o'clock tomorrow, but I ... be. 5. ... you see anything in this inky darkness? 6. You ... go when you have finished your compositions. 7. What shall we do if the train is late? It ... be late, you know, after the terrible snowstorms we've had. 8. When ... you come arid see me? — Let me see: I ... not come tomorrow, for I must be at the meeting, but on Sunday I'll find time. Yes, you ... expect me on Sunday about three o'clock. Will that be all right?
Упр. 470. Вставьте модальные глаголы may (might) или can (could).
1. ... I use your pen? 2. ... I find a pen on that table? 3. You ... read this book: you know the language well enough. 4. You ... take this book: I don't need it. 5. ... I help you? 6. ... I ask you to help me? 7. ... you help me? 8. I ... not imagine her speaking in public: I knew that she was so shy. 9. Something was wrong with the car: he ... not start it. 10. A fool ... ask more questions than a wise man ... answer. 11. She asked me if she ... use my telephone. 12. The school was silent: nothing ... be heard in the long dark corridors. 13. Waiting ... be endless, you know. 14. ... you tell me the nearest way to the city museum? 15. They ... think that I am too weak to take part in the excursion, but I am strong enough to do any kind of hard work, indeed. 16. He knew this period of history very well: he had read everything on the subject he ... find in the rich university library.