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:
Insomnia can be short-lived, lasting only one to ____ nights.
answer:
two


question:
Mammals have ____ cervical vertebrae, a number that remains remarkably constant.
answer:
seven


question:
Some fire stations house ____ ambulances.
answer:

two