How to Use "harden" with Example Sentences

1. Place chocolate-dipped fruit onto parchment-lined sheet pan to cool and harden .
2. To make the chocolate harden quickly , put it in the freezer for a few minutes .
3. Don 't harden your heart against your own relatives .
4. China seemed to harden its stance over the territorial dispute .
5. The chemicals vlasopoulos mixes with magnesium oxide and water to make the cement harden are magnesium carbonates , which he makes by adding carbon dioxide to other raw materials .