Proof read:: Everything seems right just change theses to these in the second paragraph and your good
Answer:
1
Explanation:
The rest are wrong b/c it helped <em>expand</em> China rather than isolate it, they didn't use ships on the Silk Road, and it brought better communications, etc. between countries.
It is Washington DC.
It is the location of the White House, which is where the white president lives.
They are made up of mainly hydrogen and helium. They are called the gas giants
