23. составьте текст писем-приглашений и ответов на них из следующих фраз: 1) / happy to accept/ invitation/ i/ look forward/ to participate/ the exhibition 2) ./response/ your invitation/ conference/ i/ submit/ you/ materials/ your consideration and comment/ your earliest response/ be appreciated 3) ./ very much regret/ i/ cannot accept/ the invitation/ attend the talks/ next month/ since/ it/ come/ the middle of the academic semester/ and/ i/ have lectures/ to present 4) ./i/ regret/ i cannot accept/ your kind invitation/ hope/ i/ be able/ visit you some time/ the future

1) I would be happy to accept your invitation. I was always looking forward to participate in the exhibition.
2) I will response your invitation on conference. Can you submit your materials, consideration and comment? Your earliest response would be appreciated.
3) I very much regret I can't accept the invitation. Attend to talk, since next month it comes the middle of the academic semester and i have lectures to present.
4) I regret I cannot accept your kind invitation. I hope i'll be able to visit you some times in the future.