河北干部网络学院刷课:What is black when it is clean and white when it is dirty?
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blackboard
blackboard,黑板。
blackboard in the classroom.
A blackboard.
blackboard
What is clean when it is black and dirty when it is white?
What is black when it is clean and white when it is dirty?
What is black when it is clean and white when it is dirty?
Riddles(What is black when it is clean and white when it is dirty?)
What is black when it is clean white when it is dirty?
What is black when it isclean and white when it is dirty?
What is black when it`s chean and white when it`s dirty?
what is black angel
I am black when you get me,red when you use me,and white when you're all through with me. What am I
what is the black hole is?