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.