Sentence A
I’m really interested ___ (prep.) learning more about history.
IN
It was very cold, ____ (conj.) we stayed inside.
SO
I wanted to call you, ___ (conj.) my phone had run out of battery.
BUT
I’m tired ___ (prep.) doing the same routine every day.
OF
The class starts ___ (prep.) 9 a.m.
AT
She bought a notebook ____ (conj.) a pencil.
AND