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:
Some species bear living offspring only every three to ____ years.
answer:
five


question:
Tin has ____ allotropic forms.
answer:
two


question:
Lichens come in ____ different forms.
answer:

three


