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: Eye contact is important for ____ reasons.

A: two
****
Q: Phylogenetic analyses confirm ____ mitochondrial mallard clades.

A: two
****
Q: Ribosomes contain ____ different histone proteins.

A:
four
****