Because painting frescoes requires an unusually sophisticated hand, particularly in the representation of human form, the development of drawing skill was (i) _____ to artistic training in Tuscany, and by 1500 the public there tended to distinguish artists on the basis of how well they could draw human figures. In Venice, a city virtually without frescoes, this kind of skill was acquired and (ii) _____ much later. Gentile Bellini, for example, although regarded as one of the supreme painters of the day, was (iii) _____ at drawing.