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:
Birds have ____ basic types of feathers.
answer:
three


question:
Moths are most active during the first three to ____ hours of darkness.
answer:
five


question:
Rats deprived of all sleep stages live only about ____ weeks.
answer:

three