TOEFL Prep: Subject-verb agreement

Ethics______ the study of moral duties, principles, and values.

• is

• are

Columbus, one of the state's largest cities, ____not only the capital of Ohio but also a typical metropolitan area, often used in market research.

• is

• are

The first bridge to be built with electric lights ______the Brooklyn Bridge.

• was

• were

George Gershwin, together with his brother Ira, _____ the creator of the first musical comedy to win a Pulitzer Prize.

• was

• were

The battery, along with the alternator and starter, _____up the electrical system of a car.

• makes

• make

The cerebrum, which is comprised of both right and left hemispheres, _____the muscles of the opposite side of the body.

• control

• controls

In a chess game, the player with the white pieces always _____ first.

• move

• moves

Each of the Ice Ages _____ more than a million years long.

• was

• were

The more-or-less rhythmic succession of economic booms and busts_____referred to as the business cycle.

• is

• are

Because some varieties of bacteria _____hydrogen, they are being considered as a potential energy source.

• produce

• produces