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: Cytochrome oxidase consists of two cytochromes and ____ copper atoms.

A: two
****
Q: Statistics show that one out of every ____ people has a mental illness.

A: four
****
Q: Fever is common during the first two to ____ days.

A:
three
****