Given a sentence, fill out the missing word with a 'no' or a number (between zero and ten). You should write the numbers with english alphabet, like: four instead of 4.

[Q]: Ligand seeks ____ receptors into binding and mutual phosporylation.
[A]: two


[Q]: Pertussis is highly contagious with symptoms that can linger six to ____ weeks.
[A]: ten


[Q]: Tigers are great swimmers, and they can swim three or ____ miles easily.
[A]:
four