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: Biological islands are of ____ general types, geographical and ecological.

Answer: two


Question: Cognitive therapy is a time-limited treatment lasting ____ to four months.

Answer: three


Question: Insects are arthropods that have a body with three segments, six legs, and ____ set of antennae.

Answer:
one