25. 1) Nikita has done his homework.
2) I have never played football!
3) How long have you worked in film-making?
4) Have you found the information for your project?
5) Look! The plane has already arrived!
6) This rare book has been in our museum since 1950.
26. 1a. 2b. 3a. 4a. 5 b. 6b. 7b