TOEFL Grammar Practice Test 1 (Part 1 of 2)

Snakes have an organ in a pit on their heads _____ infrared rays.

• detects

• a detection of

• it detects

• that detects

Helium is not flammable, _____ therefore safer than hydrogen.

• that is

• and is

• but is

• and it

In 1849 Walter Hunt, _____ American inventor, patented a design that served as the basis for modern safety pins.

• an

• he was an

• being

• who was, as an

Ansel Adams was a landscape photographer _____ photographs of the western United States show nature on a grand scale.

• whose

• of his

• of whom

• his

Contact lenses _____ of acrylic are more transparent and less fragile than lenses made of glass.

• making

• made

• are made

• which make

_____ other cells in the body, nerve cells are not healed or replaced when they are damaged or destroyed.

• Different

• Unlikely

• Unlike

• But

The higher the content of carbon dioxide in the air, _____.

• more heat it retains

• than it retains more heat

• it retains more heat

• the more heat it retains

_____ most brilliant Greek inventor was Archimedes, who lived about 2,250 years ago.

• The

• One of the

• As the

• Of the

_____ flying, a bat emits a rapid series of ultrasonic signals, which bounce off any object in its path.

• When it

• When it is

• It is

• When is

_____ does not circle around the earth was proven by Galileo.

• Since the rest of the universe

• As the rest of the universe

• The rest of the universe

• That the rest of the universe