51. Many scientists, however, are _________ about giving animals the full range of emotionsthat humans can feel.

52. __________ the problem is that it is impossible to prove that even a human being is feelinghappy or sad.

53. It is only because we can observe body language and facial expression that we can__________ it.

54. However, most researchers ________ agree that many creatures experience fear.

55. Some scientists _________ this as a primary emotion.

56. The 26-foot bristlecone pine tree is the oldest of many that have _________ civilization aftercivilization.

57. When human first flew in space, they were amazed to discover that the only _________object visible from orbit was the Great Wall of China.

58. What can be seen when orbiting the Earth are the lights of the world’s large _____________areas.

59. Earthquakes, volcanic eruptions, and hurricanes _____________the deaths of thousands ofpeople every year.

60. One of the most violent earthquakes ever ________ was in Ecuador in 1996.

61. In many countries, the number 13 __________ to be very unlucky.

62. In the US, modern high-rise buildings __________the floor that follows 12 as 14.

63. In Christianity, this theme __________ at the Last Supper.

64. Evidence suggests that boys are the weaker sex_________ , which means that more die in

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