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:
Light drives the interconversion of ____ forms of phytochroms.
answer:
two


question:
Natural chromium contains ____ isotopes.
answer:

four