26. Yes, but computers (cost) so much money.
27. You see I (am working) on a big project and I do not exactly know when I can take my holiday.
28. I (have not read) a newspaper today yet.
29. It's OK. I (have not been waiting) for you long.
30. When one of the climbers saw that his friend was in trouble, he (ran) to help.
31. Thank you for the offer, but I think I (will stay) at home today.
32. If you revise, you (will pass) an exam.
33. Who (designs) computer programs? - Software engineers do it.
34. Where (has he been living) for the last 5 years?
35. (Did you/see) Paul in the concert yesterday?