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.

Q: Lung disease is America's number ____ killer, responsible for one in seven deaths.

A: three
****
Q: Tuataras reproduce very slowly, sometimes taking ____ years to reach sexual maturity.

A: ten
****
Q: Buttercups have five to ____ petals or sepals.

A:
six
****