The complex of emotions flowing across her face hardened into anger and determination.

If the rumor is not true, no harm done, for the disappointment will be folded into determination to fight harder.

She was no less desperate, but she seemed to focus it all into determination.

Focus your despair and/or anger into determination to get one back on them by finding something better.

A look of sorrow came briefly to his eyes, then quickly hardened into determination.

Her initial grief quickly turned into determination, however, and she refused to have the surgery.

There was a flash of regret in her eyes, then it hardened into determination.

The sorrow that had paled her face hardened into determination.

The aching pain in his chest turned into anger and determination.

She felt her anger rising and channeled it into determination.