Ответ: 1) to cover 5) the field 2) to deal with 2) the cells 3) to come from 8) a theory 4) to search for 1) clues 5) to examine 7) the word 6) to investigate 3) the problem 7) to develop 10) the basis 8) to divide into 9) groups 9) to provide 6) facts 10) to shape 11) the views
11) to invent 4) tools