18. at last the librarian gave me the book which i (wait) for during two months. 19. he (write) the composition for three hours and he said he (finish) it soon. 20. on entering the drawing-room he (find) that his two friends (get) up and (wait) for him.

At last the librarian gave me the book which I (had been waiting) for during two months. 19. He (had been writing) the composition for three hours and he said he (would finish) it soon. 20. On entering the drawing-room he (found) that his two friends (had got) up and (were waiting) for him.