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rewrite the sentences in perfect continuous tense using time adverbials given in parenthesis.

example
i study behavior of wild elephants(lately).
lately i have been studying behavior of wild elephants.

1 john creates amazing visual ilusions (recently)
2 jane goodall studies chimpanzee (all her adult life).
3 marie curie discovered radioactivity and new diagnostic methods in medicine were developed (since)
4 many myths about use of tool by animals were dispelled (recently)
5 the scientific phenomenon of a deja vu is not fully explained (yet).
6 scientists are trying explain the phenomenon of sailing stones (for years).​

1. This is the most beautiful monument in Paris. 2. The library of the British Museum is the richest in Great Britain.  3.  Lev Yashin was the best  football goalkeeper in the history. 4. Mr. Brown is the most experienced judge in the court. 5. That case is the most difficult in my practice. 6. Spring is the most pleasant time in a year. 7. January is the coldest month in a year. 8. Babylon's code of laws is the most ancient  in the world. 9. Murder against a person is the most horrible crime. 10. Theory of state and law is the most difficult subject for me.

2. I had been waiting for him for 20 minutes when I realised that I was in the wrong restaurant.
3. At the time the factory closed down, Sarah had been working there for five years.
4. The orchestra had been playing for ten minutes when a man in the audience suddenly began shouting. 
5. I had been walking along the road for five minutes when I saw a monster. 

16.3

1. It was very noisy next door. Our neighbours were having a party.
2. We were good friends. We had known each other for a long time.
3. John and I went for a walk. I had difficulty keeping up with him because he was walking so fast.
4. Mary was sitting on the ground. She was out of breath. She had been running.
5. When I arrived, everybody was sitting round the table with their mouths full. They were eating.
6. When I arrived, everybody was sitting round the table and talking. Their mouths were empty but their stomachs were full. They had eaten.
7. Jim was on his hands and knees on the floor. He was looking for his contact lens.
8. When I arrived, Kate was waiting for me. She was rather annoyed with me because I was late and she had been waiting for a very long time.
9. I was sad when I sold my car. I had had it for a very long time.
10. We were extremely tired at the end of the journey. We had been travelling for more than 24 hours.