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: Dogs are pack animals, and ____ dogs is the minimum number for proper socialization.

Answer: five


Question: Copper has ____ naturally occurring isotopes.

Answer: two


Question: Real shadows have ____ parts, the umbra and penumbra.

Answer:
two