svp aidez moi je ni cromprend rien

1- was / discovered 
2-were / held 
3-was/beard ( je suis pas sure)
4-was/invented
5-is /considered
6-were/used
7-is/located
8-is/spoke(pas sure)
9-been/wrote
10-is/celebrated
11-is/celebrated
12-is/celebrated
13-was/built
14-is/included
15-was/settled(pas sure)
16-are/produced
17-be/seen
18-are/represented
19-is/made
20-is/called
i hope i helped you ;) bon soir :))