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: Marsupials have ____ vaginas and a double uterus.

A: two
****
Q: Hypertension afflicts about ____ in four American adults, both men and women, of all ages.

A: one
****
Q: Most birds of prey have three toes in front on their feet , and ____ toe in the back.

A:
one
****