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: Plants have roots for ____ main reasons.

Answer: two


Question: Collages can have two or ____ layers.

Answer: three


Question: Gypsy moth spends four to ____ weeks in the larval stage.

Answer:
six