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: Human malaria is caused by ____ species of Plasmodium . .

A: four
****
Q: Nests Have at least one nest for every three to ____ hens.

A: four
****
Q: Tricyclic pills extend the menstrual cycle to ____ months.

A:
three
****