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 children start primary school at ____ years of age.

Answer: five


Question: Teething begins for most babies around ____ to six months.

Answer: four


Question: Manatees comprise ____ of the four living species in the order Sirenia .

Answer:
three