| 1 | The teacher wrote two words on the blackboard. | |
| 2 | The teacher pointed out our mistake on the blackboard. | |
| 3 | The teacher wrote down today's homework on the blackboard. | |
| 4 | He tapped on the blackboard to get the classmates' attention. | |
| 5 | Xiao Ming stood in front of the blackboard and gave a presentation to his classmates. |
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