Поставте a или an teacher is going to give you good mark. i have got interesting book for you there are in our town take duster and clean blackboard!

A teacher is going to give you a good mark

I have got an interesting book for you

There are a lot of parks and gardens in our town

Take a duster and clean blackboard!

A teacher is going to give you a  good mark.

I have got an  interesting book for you

There are a lot of parks and gardens in our town

Take a  duster and clean blackboard!