Read the text and fill in the gaps with the correct grammatical forms, choosing them from the four suggested options.

Pablo Picasso showed his truly exceptional talent from a very young age. He learned to draw before he could talk. His father worked as a drawing teacher at a college. He ... an amateur artist. Pablo often watched his father paint and sometimes was allowed to help ... . One evening his father was painting a picture of their pigeons when he had to leave the room. He returned to find that Pablo had completed the picture, and it was so amazingly beautiful and lifelike that he gave his son his own palette and brushes. Pablo was just 13. From then onwards there was no stopping him. Many people realized that he was a genius but he disappointed those ... wanted him to become a traditional painter. He was always breaking the rules of artistic tradition and shocked the public with his strange and really ... pictures. He is probably best known for his “Cubist” pictures, which used only simple geometric shapes. His paintings of people were often made up of triangles and squares with their features in the wrong place. His work changed ... ideas about art, and to millions of people modem art means the work of Picasso.