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: Marine biologists have ____ theories on why whales breach.

A: two
****
Q: Account is a ____ character code that describes the basic accounting classifications.

A: six
****
Q: Most children work full-time, seven hours per day, and ____ days a week.

A:
six
****