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: Women account for ____ in ten people diagnosed with the disease.

A: eight
****
Q: Couples spend ____ billion dollars a year on infertility treatments.

A: two
****
Q: Antibodies contain ____ pairs of protein chains.

A:
two
****