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: Hedgehogs give birth to one to ____ babies which are born with the spines just below the skin.

A: seven
****
Q: Infected rodents carry and secrete the virus for about ____ days.

A: seven
****
Q: Psychiatrists say one out of ____ people are mentally ill.

A:
four
****