Вставьте модальные глаголы can, mау, must или need. 1. Peter ... return the book to the library. We all want to read it. 2. Why ... not you understand it? It is so easy. 3. ... we do the exercise at оnсе? — Yes, you ... do it right now. 4. ... you pronounce the word? 5. You ... not have bought this meat: we have everything for dinner. 6. I ... not go out today: it is too cold. 7. ... I take your pen? — Yes, please. 8. We ... not carry the bookcase upstairs: it is too heavy.