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: Insects are identified by having ____ sets of paired legs, while isopods have seven.

Answer: three


Question: Fruit is a silique opening by ____ valves.

Answer: two


Question: Baseball has ____ eras.

Answer:
three