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: International mail consists of ____ categories of mail.

A: three
****
Q: Females usually reach sexual maturity at about four years of age, males at about ____ years.

A: six
****
Q: Common genets have ____ distinct calls.

A:
five
****