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]: Dogs are pack animals, and ____ dogs is the minimum number for proper socialization.
[A]: five

[Q]: Lantanas bloom in a dense head with individual tubular florets with four or ____ lobes.
[A]:
five