A kettle is loudest in the minute before it boils, and then it grows quiet. Water toucthe elereaches boipoint fi, and tbubbles forthere riinto coowater ab. Each bubcollapses as it rises, and every collapse sends a sharp pulse through the metal wall. Thousands of them together make the familiar hiss. Once the whole body of water is hot, bubbles survive to the surface, nothing collapses, and the noise fades just as the steam appears.

Type only the missing letters. Each box is one letter, and the number of boxes matches the letters that are missing.