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.
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Question: Sexual reproduction involves the union of cells from ____ parents.

Answer: two


Question: Lions spend much of their time resting and are active only about ____ hours every day.

Answer: four


Question: Laughter first appears around ____ to four months in response to active stimuli.

Answer:
three