If you're in connections, heres the answers -
1) An underwater archaeologist (studies) shipwrecks and artifacts from watery graves. - present
2) Archaeologist (have found) underwater treasures such as jewels, precious metals, and even medical instruments. - present perfect
3) Radioactive material in the Garigliano River (made) underwater searches there dangerous. - past
4) Many students of archaeology (will have) completed an archaeological dig by graduation. - future perfect
5) I am happy __ Leonardo da Vinci's Mona Lisa - To have viewed
6) Da Vinci was one of the most interesting artists __ during the Italian Renaissance. - to have lived
7) The Duke of Milan was confident enough in Da Vinci __ that Da Vinci create a great sculpture of a horse in honor of the duke's father. - to suggest
8) __ the design, Da Vinci names it Il Cavallo, meaning "The Horse" in Italian.- Having created