Once professor Higgins (23) was calledin
the morning and told that his aunt had been taken to the hospital. As he had (24) to go to her at once, he
drove to school, went into the classroom
and wrote on the chalkboard:
"Professor Higgins is (25)
unable to have his classes today". There were several boys in the classroom,
and one of them came (26) up and
erased letter "c". He wanted (27)
to make everybody (28) laugh
But the teacher disliked such jokes. He took the duster and cleaned (29) away letter "l".
The boys came running to look at the (30)
sentence Nobody to be blamed but themselves!