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請根據(jù)所給首字母或中文提示，寫出單詞在句中的正確形式。每空只能填一詞，將單詞完整地寫在答題卡上。（每小題1分，共10分）

81. We should protect the animals in d _________.

82. Susan was so careless that she made many m_________ in the test.

83. Can you give me some a_________? My English is so poor.

84. Singing English songs can i_________ our English.

85. My son likes eating hamburgers. He says they are very d_________.  

86. It’s _________ （禮貌的） to wait for everyone to put some food on their plates.

87. The _________（氣溫）will fall below zero.

88. They didn't have _________（足夠的）food to eat and they felt hungry.

89. Plants and animals can't live _________（沒有）air or water.

90. Don’t be _________（緊張的）. It’s easy.