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.
--------
Question: Brook stickleback have prominent mouths, large eyes and ____ to six spines on their backs.

Answer: four


Question: Light drives the interconversion of ____ forms of phytochroms.

Answer: two


Question: Some children play games five or ____ days a week.

Answer:
six