Use "bold face" in a sentence

1. With a bold face, she says to him:

2. Runners-up in bold face were given at-large berths.

3. Putting on a bold face, she utters her words confidently.

4. Why some headings of columns are selected a bold face font, and some of them – not?

5. 3 Bold face letters represent amino acids identical or similar between two proteins with the numbers of amino acid residues.