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(A) 根据句意和首字母提示补全单词。

66. Mr. Smith o___________ his guests some coffee or tea when they came to his home.

67. Today, everyone o_____________ to be a greener person.

68. Litter i______________ the look of our city, so people shouldn’t throw it around.

69. Edison had many great i__________________ in all his life.

70. Have you d________________ with these problems yet?

(B) 根据句意，用所给单词的适当形式填空。

develop, produce, die, spit, pollute

71. Can you see the sign “No ____________” over there?

72. Air _____________ is the most serious problem at the moment.

73. As we know, China is still a ______________ country in the world.

74. Jane felt frightened (害怕) as soon as she saw the _____________ snake.

75. Do you know America is one of the world’s largest ______________ of oil?

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