Practice - Structure TOEFL [Skill 9-12]

1. Dolphins form extremely complicated allegiances and_____ continually change.

• enmities that

• that are enmities

• enmities that are

• that enmities

2. 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 can

3. The Apollo 11 astronauts_____of the Earth’s inhabitants witnessed on the famous first moonwalk on July 20,1969, were Neil Armstrong and Buzz Aldrin.

• whom

• whom millions

• were some

• whom some were

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

• has

• it has

• and

• which has

5. _____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

6. 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

7. 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

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

• It

• What

• When

• That

9. 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

10.The fact_____the most important ratings period is about to begin has caused all three networks to shore up their schedules.

• is that

• of

• that

• what