О чем свидетельствуют черты сходства млекопитающих и пресмыкающихся?

I am going to invite a group of students.
We are going to miss lessons at school.
A group of students are going to visit Great Britain.
My friends are going to arrange a school party.
Our Head teacher is going to be responsible for social program.
Mr Wooding is going to write an invitation letter.