hardening

"The "k" sound in "kite" is a consonant. "

"My friend told me there was something in the box, but I didn't know what it was yet. "

"strengthen a muscle"

"My sister has a sensitivity to subtle changes in the weather; she can feel an approaching storm hours before anyone else notices. "

"The voiceless student sat silently in class, unable to speak. "

"The student was a strong resistant, leading the group in their peaceful protest against the unfair school rules. "

"The long commute was very stressful. "

"The blacksmith hammered the hot metal into a horseshoe. "

"The student's malicious comment about his classmate's new shoes hurt her feelings. "

"A kettle converts water into steam."

"The mathematical transform used to convert the raw data into a frequency spectrum helped the engineers analyze the sound waves. "

"emotional crisis"