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:
Fruit is a silique opening by ____ valves.
answer:
two


question:
Females usually reach sexual maturity at about four years of age, males at about ____ years.
answer:
six


question:
White sturgeon inhabit ____ large river systems, all on the western coast of North America.
answer:

three