Radioactive material in the garigliano river "made" underwater searches there dangerous. present perfect past perfectpastmany students of archeology "will have" completed an archaeological dig by graduation. future perfect futurepresent perfect

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