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:
Some species have more than ____ pairs of walking legs.
answer:
four

question:
Atoms are extremely small, on the order of a few ____ billionths of a meter.
answer:
ten

question:
Paramecium has more than ____ species.
answer:
eight