Ответ:

1) Before we came they didhad done their work. 2)Nick had written to me before I senthad sent my e-mail. 3) The door opened and my brother camehad come in. 4)By the age of to he learnedhad realned to tead and write. 5)After he finishedhad finished college, he went to University to become a biologist. 6)By the age of ten he had readread all the books in his libary. 7) He was ready for his exams and soon becamehad become the youngest scientist in the histity. 8)I came up to the table, sathad sat down and began working. 9)She learned that I had becomebecame a champion. 10) Tom readhad read a lot of books on anatomy when he went to medical school. 11) My sister came from school very tired and decidedhad decided to relax in front of the television. 12) The house looked terrible because the wind and the rain damagedhad damaged it badly. 13) By the beginning of the year she had joinedjoined our team. 14) He began to feel better because he gavehad given up smoking. 15)I didn't feel very well because I had eatenate to much junk food .16)When his friends were in the second year, he lefthad left school.