Many questions have been answered by John. He must have previewed the lessons last night, ____ he?
32. ________, as long as I’m with nature, I don’t care.
31. I would rather buy a house in the countryside than in the city. 32.
29. —It’s hard to believe that Jack ________ have fought with the policeman. —Yes. If one ________ ask for trouble, it can’t be helped.
28. If our car had not ________, we would have been here on time.
27. This new kind of chemicals will help keep the air, soil and water________ from pollution.