Problem: Many compound materials exhibit polymorphism, that is they can exist in different structures called polymorphs. Silicon carbide (SiC) is unique in this regard as more than 250 polymorphs of silicon carbide had been identified by 2006, with some of them having a lattice constant as long as 301.5nm, about one thousand times the usual SiC lattice spacings.

Based on the paragraph above can we conclude that "Silicon carbide consists of three different elements"? OPTIONS:
- Yes
- It's impossible to say
- No

A: It's impossible to say

Problem: The presidents of Ecuador and Peru say they have agreed to work together to try to find a peaceful solution to their long-running border dispute.

Based on the paragraph above can we conclude that "The dispute about the border has gone on for some time."? OPTIONS:
- Yes
- It's impossible to say
- No

A: Yes

Problem: Fail<br>John wanted to write a novel. He took a six month sabbatical from his teaching position. John wrote and wrote for several months straight. He sent his manuscript to an agent he trusted. The agent wrote back, saying the novel was terrible!

Based on the paragraph above can we conclude that "John felt he had wasted his time when his novel was rejected."? OPTIONS:
- Yes
- It's impossible to say
- No

A:
It's impossible to say