As the only^(A) major American river that flowed^(B) in a west^(C) direction, the Ohio was preferred^(D) route for settlers.

• A

• B

• C

• D

During the annually^(A) salmon migration from the sea to fresh^(B) water, Alaska's McNeil River becomes a gathering^(C) place for brown bears waiting eagerly^(D) to catch their fill.

• A

• B

• C

• D

Edelman stresses the mounting^(A) evidence showing^(B) that greatly^(C) variation on a microscopic scale is likely^(D).

• A

• B

• C

• D

Perhaps the most welcoming^(A) and friendly^(B) of the park's wild places is the live^(C) oak forest that surrounds the district's alone^(D) visitors' center in Gulf Breeze.

• A

• B

• C

• D

Halley's comet, viewing^(A) through^(B) a telescope, was quite^(C) impressive^(D).

• A

• B

• C

• D

The state of deep^(A) sleep^(B) is characterized^(C) by^(D) rapid eye movement, or REM, sleep.

• A

• B

• C

• D

Among^(A) the disputing^(B) sections^(C) of the Monteverdi opera are^(D) the sinfonia, the prologue, and the role of Ottone.

• A

• B

• C

• D

Most probably^(A) because of the likable^(B) rapport between anchors, the night^(C) newscast on the local ABC affiliate has recently^(D) moved well beyond its competitors in the ratings battle.

• A

• B

• C

• D

Signing^(A) at the outset^(B) of a business deal, a contract offers the participants a certain^(C) degree of legal protection from costly^(D) mistakes.

• A

• B

• C

• D

The story presented by Fischer is a headlong^(A) tale told so effectively^(B) that its momentum^(C) carries the reader tight through the live^(D) endnotes.

• A

• B

• C

• D