—What worried him so much?—His hair is __________ grey.
29. Heat capacity is the amount of energy it takes __________the temperature of a substance one degree centigrade.
28. This is the road ________ the mountain.
27. The photo _______ me of my happy childhood.
26. _______ in a beautiful evening dress, she decided to attend an important party.
25. By taking the scientific development of his day one step ___, Jules Verne ____ the foundation of modern science fiction.