A: (what's your favourite music? )can you tell me 'what your favourite music is'? b: yes, it's hip-hop music.a: (when did hip-hop music start? ) do you know b: oh, back in the 1980s, i think! a: i see. (how many cds have you got? ) do you know exactly b: oh, hundreds - i've lost count of them! a: (where do you keep them? ) could you tell us b: yeah, on the shelves in my room.a: (how much money have you spent on them? ) have you got any idea b: oh, i've lost count of that too. i don't want to think about it! a: (which was the first record you bought? ) can you remember b: no, sorry, i can't remember.a: (which band do you like the most? ) can you tell me b: i guess it's ghetto dogs

1when i went to see the head of the "green party" in 1  when i went to see the head of the "green party" in  the hotel, he already gave an interview to journalists and rested. 2 when i arrived at his hotel, we got in touch with ourpartners by phone and appointed a meeting with them. 3 when he arrived your fax, we have not received specific response over the concentration of harmful substances in the air 4 the young scientist has done a huge preliminary work on problems of ecological imbalance before made a presentation at the conference. 5 by the end of the century most of the problems associated with the depletion of the ozone layer will be solved successfully. 6 when representatives of most countries will join the movement for the protection of the environment, they will take the necessary measures to protect our forests, rivers, lakes and the sea. 7   we learned that our partners have not made a final solutions for the problem of cooperation.ect our forests, rivers, lakes and the sea.

1. They offered me a cup of tea.

A cup of tea was offered to me.

I was offered a cup of tea.

2. Students take examinations at the end of each term.

Examinations are taken at the end of each term ( by students).

3. The waiter will serve you breakfast in five minutes.

Your breakfast will be served in five minutes (by the waiter).

4. We have just sent for the doctor.

The doctor has just been sent for.

5. The lights went out when they were serving the meal.

The lights went out when the meal was being served.

6. The police were following him until he got to the office.

He was being followed by the police until he got to the office

7. They haven’t brought back my skates.

My skates haven’t been brought back (by them).

8. They are repairing the clock now.

The clock is being repaired by them now.

9. He had interrupted me.

I had been interrupted by him.

10. I will have read this book by 10 o’clock tomorrow.

This book will have been read by me by 10 o’clock tomorrow.