Question

this is ___ most interesting book on ___ history of ___ English language​

Answer 1

$\huge\boxed{\mathcal{\purple{A}\green{N}\pink{S}\blue{W}\purple{E}\green{R}\pink{!}}}$

$\huge \implies \large \rm\:the$

$\huge \implies \large \rm\:the$

$\huge \implies \large \rm\:an$

Answer 2

Answer: the , the, nothing respectively

I think that the third one is nothing