Преобразуйте предложения, поставив выделенные сущест­вительные и местоимения в ?

Преобразуйте предложения, поставив выделенные сущест­вительные и местоимения в ??ножественное число. There is a letter on the table.-There arc some letters on the table. He is a manager.-They are managers. 1. I saw a boy in the street. 2. He is a businessman. 3. I received a letter from England. 4. There is a fish in the jar. 5. Send the fax to him. 6. Don't sign the contract. 7. The director is out. 8. A sales representative must be a creative person. 9. He works as a foreman at our company. 10. He became the president of a big company. 11. The delivery will be delayed for approximately 5 days. 12. The firm did not pay duty in time.