1. The rules of effectively holding up a conversation with someone can be summed up in the following sentences. First of all, you must have an interesting topic. it must interest both you and who you are conversing with. Second, the tone of the conversation must be interesting, and not boring and robot-like. Third of all, use gestures and keep eye contact with who you are talking with throughout the conversation. And lastly, if you have nothing to say at all, and if have a long silence that you can't break in your conversation, then the last method that you can use is to say something completely random. This random saying has to be funny though, and should have an element of surprise. 

2.The United States of America is one of the largest countries in the world based on both population and land area. It has a relatively short history compared to other world nations, has one of the world's largest economies, and has one of the world's most diverse populations. As such, the United States is highly influential internationally.

(Here are the facts on this site about USA →　http://geography.about.com/od/unitedstatesofamerica/a/unitedstatesfacts.htm）

3. As the world's largest country, Russian has a very diverse geography.

Northern Russian extends into the Arctic Circle. This area is primarily tundra and forests, with thousands of lakes.

Russia has many mountain areas. The Ural mountains cover 2,500 miles of eastern Russia. The Caucasus mountains cross the southern part of Russia, from the Black Sea to the Caspian Sea.

From the western boarder to the Ural mountains is the North European Plain. This is a large rolling plain with rich soil and grasslands.

Three quarters of the Russian population lives in the cities and towns of western Russia.