Эти предложения надо поставить в утвердительную форму.
1. She has found a wallet on the road.
2. We have tidied our country house.
3. The weather has changed.
4. Liz has left you a note.
5. They have moved to another hotel.
6. I have caught a big fish.
7. Pupils have learned this poem.
8. Mike has booked the tickets for us.
9. The plane has landed.
10. The doctor has prescribed some medicine.

1. Nina celebrated her birthday yesterday. Her room looked beautiful, there were many flowers in it. When I came in, somebody was playing the piano, two or three pairs were dancing. 2. Listen! Somebody is playing the piano. 3. I  like music very much. 4. When I  looked out of the window, it was raining heavily and people were hurrying along the streets. 5. What  were you doing at seven o'clock yesterday? — I was having supper. 6. When I  came home yesterday, I  saw that all my family was sitting round the table. Father was reading a letter from my uncle who  lives in Paris. 7. Where were you  yesterday? — I was at home the whole day. — How strange. I rang you up at two o'clock, but nobody  answered. — Oh, I was in the garden. I was reading your book and did not hear the telephone. 8. What wereyou  doing at five o'clock yesterday? — I was working in the library. — I was there, too, but I did not  see you. 9. Yesterday I was working at my English from five till seven. 10. It was raining the whole day yesterday. 11. Where is your sister  now? — She is in her room. She is doing her homework.

Profession veterinarian has a very long history.  In the early stages the attention to animal health was the basis of personal approach to cattle farmers, but over time humanity, united with medicine, resulted in a new and quite popular around the world, financially profitable and relevant profession veterinarian.The terms of the professional duties of the specialist treatment and prevention of animal diseases, as well as conducting various health and beauty treatments, including operations, veterinary and sanitary control in the production and sale of animal products. Здесь конечно не 15 предложений,но это все что смогла)