Great changes ___ in the city, and a lot of factories ___.
35. The poor old man _____ blind when he was very young.
34. ----There's something wrong with the machine. Who is _____? -----None. The machine is too old to work.
33. --- Do you think it’s to rain over the weekend?--- _____.
32. I ____ what he said, but I don’t _____ him.
31. Do you know when did the world _____?