31. More attention must _________________ to the issue of pollution., be paid, to pay, 32. If you think that, you can’t _________________ to his lecture., be listen, have been listening, 33. The problem of global warming should _________________ a long time ago., be solved, have been solved, 34. He isn’t here yet. I’m not sure what _________________ to him., should be happening, could have happened, 35. Those plants can’t _________________ properly – they’re almost dead., have been looked after, be looking after, 36. If the story were true, there ________ much more about it in the news., would have been, had been, is, 37. I’m guessing that most people ________ about how dinosaurs died out when they were at school., will have read, might read, read, 38. Any animal you buy from a good pet shop ________ checked by a vet., will have, should have been, have, 39. I got food poisoning from that new café last week. The food ________ cooked properly., can’t, can’t be, can’t have been, 40. It has been said that the camel ________ originally in North America., may have lived, should have lived, should be living

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