1. Helium is _____ all gases to liquefy and is impossible to solidify at normal air pressure.

(A) more than difficult

(B) the most difficult of

(C) more difficult of

(D) most difficult

 

2. Every year Canadian ______ about 75 percent of their exports to the United States.

(A) businesses that sell

(B) selling businesses

(C) businesses sell

(D) that sell to businesses

 

3. An innovator, ballerina Augusta Maywood was ___ a traveling company.

(A) to form the first

(B) the first to form

(C) who formed the first

(D) forming the first

  

4. When water freezes in the cracks of rocks, _____ expands, causing the rocks to break apart.

(A) it

(B) but

(C) then

(D) and

 

5. With x-ray microscopes scientists can see through live insects ___ even through solid pieces of metal.

(A) however

(B) nevertheless

(C) or

(D) yet

 

6. Dennis Chavez of New Mexico _____ to the House of Representatives in 1930 and to the Senate in 1938.

(A) when elected

(B) elected

(C) who was elected

(D) was elected

 

7. _______ are not leached out of soil, reclamation procedures are needed to restore the land’s productivity.

(A) For concentration of salt

(B) Salt concentrations that

(C) If salt concentrations

(D) With concentrations of salt

 

 8. ______ social crusade aroused Elizabeth Williams’ enthusiasm more than the expansion of educational facilities for immigrants to the United States.

(A) No

(B) Nothing

(C) Not

(D) None

 

9. ______ as 2500 B.C., the Egyptians used mirrors made of highly polished metal.

(A) In early

(B) As early

(C) Early

(D) Was as early

 

10. The quantum theory states ______, such as light, is given off and absorbed in tiny definite units called quanta or photons.

(A) energy that

(B) that it is energy

(C) it is energy

(D) that energy

 

11. Quails typically have short rounded wings that enable _______ spring into full flight instantly when disturbed in their hiding places.

(A) they

(B) to their

(C) its

(D) them to

 

12. Geysers are found near rivers and lakes, where water drains through the soil ______.

(A) surface below the deep

(B) deep below the surface

(C) the deep below surface

(D) the deep surface below

  

13. Algebra generalizes certain basic laws _____ the addition, subtraction, multiplication, and division of all numbers.

(A) govern

(B) that govern

(C) have governed

(D) which they govern

  

14. Even at low levels,______

(A) the nervous system has produced detrimental effects by lead

(B) lead’s detrimental effects are producing the nervous system

(C) lead produces detrimental effects on the nervous system

(D) the detrimental effects produced by lead on the nervous system

 

15. _____ a lonely and rugged life, far from home and family.

(A) However the early gold prospector often lived

(B) The early gold prospector often lived

(C) Not only did the early gold prospector often live

(D) The early gold prospector often living