(1) Bread is rich in sugar, and eggs and milk are rich in protein; you should also take in a certain amount of vitamins, and you can eat some fruits and vegetables; therefore, fill in: eggs, milk; fruits and vegetables ;

(2) Grapefruit peel can also absorb indoor odors, indicating that it has adsorption properties. Activated carbon has adsorption properties, so fill in: activated carbon;

(3) According to the solute mass = Solution mass × mass fraction of solute = 200g × 0.9% = 1.8g; therefore fill in: 1.8.