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 gestation is divided into three trimesters of ____ months each.

A: three
****
Q: All ticks have ____ pairs of legs during the immature stage and four pairs as an adult.

A: three
****
Q: Humans have ____ breasts .

A:
two
****