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:
Pyrimidines contain ____ ring and purines contain two rings.
answer:
one


question:
Perennials are plants that live more than ____ growing seasons.
answer:
two


question:
Plagioclase is the liquidus phase in the ____ investigated systems, followed by the magnetite.
answer:

three