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.

[EX Q]: Cells contain ____ families of small organic molecules.
[EX A]: four

[EX Q]: Salsa works on the basis of Mambo - a pattern of ____ steps danced over eight counts of music.
[EX A]: six

[EX Q]: Mangroves are the common name for ____ species of trees and shrubs found along warm water coasts.
[EX A]:
three