Вставьте местоимения8) We are going to spend ______________ holidays at the seaside. 9) Mark claims (утверждать) this book to be _________. 10) The two countries have recently exchanged _______ ambassadors. 11) We must see ________ doctor. 12) The bird sang _______ happy tune. 13) She has lots of colored pens. But this one is not ________.