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:
Brook stickleback have prominent mouths, large eyes and ____ to six spines on their backs.
answer:
four


question:
Tin exists in ____ allotropic forms.
answer:
three


question:
Gravity is the force that brings ____ objects together.
answer:

two