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: Lancelets display all ____ of the vertebrate characteristics throughout their lives.

Answer: four


Question: World population continues to rise, even as a few countries move toward ____ growth.

Answer: zero


Question: Some researchers indicate that ____ out of five young people have had sex by the age of thirteen.

Answer:
one