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.

Insects go through either three or ____ stages.
four

Sexual maturity is reached within ____ to four years.
two

Salsa works on the basis of Mambo - a pattern of ____ steps danced over eight counts of music.

six