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:
Manatees swim ____ to six miles per hour.
answer:
two


question:
Airplanes still fly four to ____ times faster than zeppelins.
answer:
five


question:
Hydrops fetalis results from ____ Alpha-chain gene deletions .
answer:

four