1. on
2. in
3. on
4. at
5. in
6.at
7.on
8.on
9.in
10.on
11. to
12. of
13. of
14. of
15. of
16. in
17.in
18 to
19 of
20 as
What are the units? I can help you write out an outline if you give me a little more information.
D and A. Hope i helped :)
Answer:
Because, the United States primarily use the english language, but the contenent itself has different cultures which makes it Universal.