Answer:
1. Mediterranean Sea; 2. Aegean Sea; 3. Thames River
Explanation:
1. Transport from Spain to Italy
The Mediterranean Sea provides easy transport from the Spanish ports of Valencia and Barcelona to the Italian ports of Savona, Livorno, Civitavecchia, Salerno, and Palermo.
The Black Sea and the Volga and Danube rivers are on the eastern side of Italy, so they would not be used for such transport.
2. Importance to Ancient Greeks
Ancient Greece surrounded the Aegean Sea, so the Sea was of great importance for transport and communication be the various areas of the region.
The Black Sea and the Volga and Danube River were far from ancient Greece.
3. Asset for city of London
The city of London straddles the Thames river, which extended far into the countryside. It therefore served as a major route for bringing food and supplies to to the city.
The Seine River is in France, the Mediterranean is south of Europe, and the Atlantic Ocean is far side of the British Isles.
