blackboard

学生们轮流到黑板前解答数学题。

The students took turns solving math problems on the ___blackboards.

老师在黑板上写字。

The teacher writes on the ___blackboard.

看黑板上的单词。

Look at the words on the ___blackboard.

请把答案写在黑板上。

Please write the answer on the ___blackboard.