Structure TOEFL Skill 9-12

Dolphins form extremely complicated allegiances and _______ continually change.

• enmities that

• that are enmities

• enmities that are

• that enmities

Scientists are now beginning to conduct experiments on _______ trigger different sorts of health risks.

• noise pollution can

• that noise pollution

• how noise pollution

• how noise pollution

The Apollo 11 astronauts _______ of the Earth’s inhabitants witnessed on the famous first moonwalk on July 20, 1969, were Neil Armstrong and Buzz Adrin.

• whom

• whom millions

• were some

• whom some were

At the end of the nineteenth century, Alfred Binet developed a test for measuring intelligence _______ served as the basis modern IQ tests.

• has

• it has

• and

• which has

  _______ have at least four hours of hazardous materials response training is mandated by federal law.

• All police officers

•  All police officers must

•   That all police officers

•  For all police officers

In a 1988 advanced officers’ training program, Sampson developed a plan to incorporate police in enforcing environmental protection laws whenever _______ feasible.

•   it is

• is

• has

• it has

_______ will be carried in the next space shuttle payload has not yet been announced to the public.

• It

• What

• When

• That

During free fall, _______ up to a full minute, a skydiver will fall at a constant speed of 120 m.p.h.

•   it is

• which is

• being

• is

The fact _______ the most important ratings period is about to begin has caused all the networks to shore up their schedules.

• is that

• of

• that

• what

A cloud’s reservoir of negative charge extends upward from the altitude at _______ the freezing point. 

• temperatures hit

• hit temperatures

• which temperatures hit

• which hit temperatures