下图分别表示天体系统的四个层次，其中有且只有一颗恒的层次是：
All of us still remember the terrible earthquake that Tangshan twenty years ago.
The College Entrance Examination near, so you should be prepared for it.
— What is that building? — _____ the garden equipment is stored.
— Is he said ____ his car lost? — Yes. He was so foolish ____ leave his car ____.
Whether we’ll hold the sports meet depends on the weather, _____?
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