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.

Many diseases require the tick to be attached for ____ or more hours to transmit disease.
six

Respiratory therapists complete two to ____ years of education.
four

Leopard geckos reach sexual maturity at the age of ____ to three years .

one