1. What are you doing? - We are preparing for the concert.
2. Where are you going? - I'm going to the library.
3. Where is Nicholas? - He's in the reading room. Is doing his homework there. Nicholas often does his homework in the reading room.
4. Is Lena at home? - No, it's not at home. She is having a music lesson. She always has music classes at this time.
5. Do not make noise. Kovalenko is speaking on the telephone.
6. Do not go into that room. There's a group of our students sitting a Maths exam.
7. Students sit examinations twice a year.
8. His son is going to become an economist.