Add relative pronouns to the sentences where necessary. Sometimes more than one answer is possible. If a relative pronoun is not necessary, type 'X' in the gap.

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.

1. The hostages were rescued (сказуемое в страдательном залоге) without a shot being fired (обстоятельство - при произведении выстрела).
2. I wish my refrigerator would stop making (составное сказуемое - прекратить делать) that terrible noise. You can’t hear anyone speaking.
3. The results received (определение - какие результаты) were of great importance for further work.
4. People living (определение - какие люди) in Japan have some customs different from ours.
We had already had lunch when he came.