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: Fitness has ____ components, aerobic and muscular.

Answer: two

Question: Dholes are highly social animals and live in packs of about ____ dogs.

Answer: ten

Question: Tobacco currently kills ____ million people per year.

Answer:
four