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.
--------
Question: Some species have more than ____ pairs of walking legs.

Answer: four


Question: Irrigation can increase land productivity by three to ____ times, especially in the north.

Answer: seven


Question: Children can begin at around ____ years of age.

Answer:
eight