The Tsugaru Strait in Japan is one of the most dangerous straits in the world. The weather there is unpredictable and often deadly. A typhoon near the strait killed 1,430 people in 1954. Yet people wanted a way to cross the strait without harm. So, the Japanese government built the Seikan Tunnel. It runs 800 feet (243 meters) below the sea. Two stations in the tunnel serve as emergency stops. The Seikan Tunnel was finished in 1988. It is the world's longest railroad tunnel.

Lauses unnecessary to the meanings of the words modified demonstrative 2. clauses necessary to the meanings of the words modified relative 3. words for which pronouns stand intensive 4. a pronoun ending in -self and referring to the previously used noun or pronoun nonrestrictive clauses 5. a pronoun ending in -self and used for emphasis restrictive clauses 6. pronouns that ask questions indefinite pronouns 7. pronouns that point out to whom or to what the speaker is referring reflexive 8. everyone, nobody, and something are examples antecedents 9. pronouns introducing adjective or noun clauses interrogative 10. i, you, him, mine, and their are examples personal pronouns

By comparing part 1 and 2 of polar opposites what does it mean by polar opposites

In twelve years a slave, northup realizes he cannot trust anyone after his kidnapping except hamilton and brown god the physician the women who gave him drink