Раскройте скобки употребляя глаголы в форме present simple past simple или past continuous once, while i (to walk) in a park of london, i (to see) an old man. he (to sit) on a bench holding a book in his hands. i (to see) that the book (to be) of great interest. it (to be) a very old copy of early byron's works. i (to look) at the old man and (to understand) that he (to know) that i (to sit) because of him and the book. i (to smile). "it is the last i (to have)", he (to say) and (to stretch) it out to me. i (to open) the book and (to look) at the date: it ( to be) a remarkable book. "i (to have) a hard life and this book (to be) a comfort to me. but i have to sell it," (to say) the old man.