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: Most babies double their birthweight by ____ to five months.

Answer: four


Question: Buses are ____ times as fuel efficient as cars.

Answer: five


Question: Premolars have one, two, and sometimes ____ canals.

Answer:
three