TASK DEFINITION: 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.
PROBLEM: Phylogenetic analyses confirm ____ mitochondrial mallard clades.

SOLUTION: two

PROBLEM: Yellow fever begins suddenly after an incubation period of three to ____ days.

SOLUTION: five

PROBLEM: High ankle sprains, on the other hand, can remain symptomatic for as long as ____ months.

SOLUTION:
nine