单词拼写（共15分）

81.Does the small animal have two _____ ( 胃 )?

82. We should keep the b _____ of nature.

83. He is a man of great ______ (决心).

84. I r______ him although I hadn’t seen him for 10 years.

85. This new model is of high q_____ and is not expensive either.

86. _____(想必) you locked the door? I would be surprised if you hadn’t.

87. They got into quite a heated ______ (争论).

88.The _____ (化学) teacher told us something interesting in his class.

89. O_____ food is more and more popular with people.

90. These discoveries are of no c_____ value, though they are highly praised.