Problem: And we have a fundamental choice to make. Are we going to step up to the plate as a nation the way we did after World War II, the way that generation of heroes said okay, the United States is going to be the leader. And the world benefitted tremendously from the courage that they showed in those post-war years.

Based on the paragraph above can we conclude that "The United States first became a global power in the 21st century"?

A: No

Problem: LISBON, Jan. 22 (Xinhuanet) -- Anibal Cavaco Silva, a former prime minister, won Portugal's presidential election on Sunday.

Based on the paragraph above can we conclude that "Anibal Cavaco Silva will try to do his best."?

A: It's impossible to say

Problem: Experimenting on a raft anchored on the river Elbe, Alfred Nobel tries to make nitroglycerine safer to handle. Finds that the addition of kieselguhr turns nitroglycerine into a dough that can be kneaded, and calls it "dynamite".

Based on the paragraph above can we conclude that "Rafts are not something that can be anchored."?

A:
No