A)
-I'm going to work hard.
-Well, it's rather boring. My friends and me are going to go to a discotheque. It's going to be fun! Let's go with us!
-I'm sorry. I can't. I'm going to study English grammar. My mother is going to wash clothes and clean our flat. I'm going to help her as well. In addition to it, the weather is bad, it's going to snow tomorrow.
b)
-What is Robert going to do next day?
-He's going to treat his teeth.
c)
-Are they going to take part in competition tomorrow?
- Yes, they are. But Alexander isn't going to do it.
-Oh, why is it so?
- He is not ready yet. He and his father are going to train.