1 - was invented
2 - were used
3 - are used
4 - is built
5 - was built
6 - will be built
7 - is; pinned
8 - was pinned
9 - are kept
10 - are treated
11 - is found
12 - was found
13 - are displayed
14 - was displayed
15 - will be displayed
16 - are eaten
17 - are arranged