Question

These buildings project evere centered__ (around, upon, in, into)
Thebes and Karnat. At that time many temples were___( to, at, from, in) ruins.​

Answer 1

These buildings and projects were centred upon Thebes and Karnat. At that time many temples were in ruins.

For the first blank, centred around and centred in all are valid but it depends on the context. Thebes and Karnat are places of importance to the ancient Egyptians.

Using prepositions like into is grammatically incorrect in this situation. For the second blank, to ruins, from ruins and at ruins are grammatically incorrect