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]: Ligand seeks ____ receptors into binding and mutual phosporylation.
[EX A]: two

[EX Q]: Elephants also have four molars, ____ on the top and one on the bottom on both sides of the mouth.
[EX A]: one

[EX Q]: Biennials require portions of ____ growing seasons to reproduce.
[EX A]:
two