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.
--------
Question: Females usually reach sexual maturity at about four years of age, males at about ____ years.

Answer: six

Question: Spiders have eight legs and usually have ____ eyes.

Answer: eight

Question: Reproductive maturity is reached at four to six years in females and ____ to nine years in males.

Answer:
seven