17ac, 9 letters, tall pine tree of north america: p?n?e?o??
27ac, 12 letters, (in blood test) showing no virus present: ?e?o???a?i?e
32ac, 8 letters, the ability to speak authoritatively on a subject: ???d?t?y
13d, 2 words, 6, 8, small state dependant on one export: ?a???a, ?????l?m