Mr. Black is a Maths teacher. He is very strict （严格的） with his students. He asks them never to be late for school. Sometimes the students are late， and Mr. Black is not happy.
Yesterday morning， Mr. Black got up at 7：30. He didn't have breakfast or take a shower. He ran to the station quickly. Many people were at the station but there was no bus for Mr. Black to take. So Mr. Black took the taxi. Mr. Black works at the No. 3 Middle School but the taxi took him to the No.3 Primary School. At last， Mr. Black got to school at 8.30.
"I'm sorry， boys and girls. I'm late today，" Mr. Black said to his students.
"Everyone can make mistakes. From today on， I won't ask you never to be late for school. Please do your best not to be late. Can you do it？"
"Yes， we can，" the class said to him loudly.
