instruction:
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 become sexually mature at the age of ____ years.
answer:
five


question:
Wood consists of ____ distinct fuels.
answer:
two


question:
Cowbirds have ____ types of songs, perched songs and whistles.
answer:

two