The students were having a class on a cold morning in winter. The teacher (11) with his back to the fire. He wanted to give (12)

The students were having a class on a cold morning in winter. The teacher (11 ) stood with his back to the fire. He wanted to give (12) advice to the students before he (13) began his lesson. The teacher (14) said to his students, "Before you speak, think. (15) Count fifty before you say anything important.., a hundred if it is very important, " At that time, the teacher’s coat tails caught fire, and the teacher didn’t know, but the students saw it at once. And they didn’t tell him about it.