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: Some animals have only ____ or three chambers .

A: two
****
Q: China has about one in ____ of all smokers in the world.

A: four
****
Q: Blisters normally burst and crust over within three to ____ days.

A:
five
****