TOEFL Structure (Skills 1-55)

In economics, "diminishing returns" describes ____ resource inputs and production.

When lava reaches the surface, its temperature can be ten times ____ boiling water.

Rarely ____ remove the entire root of a dandelion because of its length and sturdiness.

Operas can be broadly^(A) classified^(B) as either comedies or^(C) they are tragedies^(D).

Tungsten has the highest^(A) melting point of all metals, and for this reason it is often use^(B) in equipment^(C) that must withstand^(D) high temperatures.

Whereas^(A) there are forty-three ant species in Great Britain, the^(B) same amount^(C) of ant species can be found in a^(D) single tree in Peru.

People voice theirs^(A) opinions first in small groups^(B) or among^(C) friends and acquaintances^(D).

Inside the Lincoln Memorial is^(A) a large statue^(B) of Lincoln make^(C) from white marble^(D).

Detailed photometric^(A) data of the area just north of Triton's equatorial region indicate^(B) the existence of a thin, transparent^(C) layers^(D) of frost.

U.S. census figures indicate^(A) that people with only an^(B) elementary education can earn just half^(C) as much as college graduations^(D).