Question

we saw the bird fly high ...... the tower.
fill in preposition

Answer 1

I think it will be over the tower

Answer 2

$\textbf{\large{Answer -}}$

We saw the bird fly high $\textbf{\underline{over}}$ the tower.

Over is the correct preposition used here.

$\textbf{Preposition -}$

Prepositions are used to join the sentence.