1. Wind motion can be observed in the mesosphere by _____ the trails of meteors passing through it.
(A) to watch
(B) watching
(C) watched
(D) watch
B
 
2. Thomas Edison`s first patented invention was a device_____ in Congress.
(A) votes counted for
(B) had been counting votes
(C) for counting vote
(D) be a counted vote
C
 
3. Clara Bow, a popular actress in the 1920`s, retired _____ she was unable to make the transition from silent films to sound films.
(A) nevertheless
(B) in spite of
(C) because
(D) and for
C
 
4. Built in 1882, the Kinzua Viaduct in Mckean County, Pennsylvania, is open only to those visitors _____ are able to walk its 2,058 - foot length.
(A) who
(B) to whom
(C) which they
(D) that which
A
 
5. A bridge must be strong enough to support its own weight _____ the weight of the people and vehicles that use it.
(A) as well
(B) so well
(C) as well as
(D) so well as
C
 
6. The swallows of Capistrano are famous _____ to the same nests in California each spring.
(A) to return
(B) who returned
(C) they returned
(D) for returning
D
 
7. In the fourteenth century, _____ that glass coated with silver nitrate would turn yellow when fired in an oven.
(A) the discovery
(B) it was discovered
(C) with the discovery
(D) if it was discovered
B
 
8. _____ recurring fear is out of proportion to any real danger, it is called a phobia.
(A) When
(B) Whereas
(C) Which
(D) Whether
A
 
9. Many modern photographers attempt to manipulate elements of photography other _____ in their photographs.
(A) than light is
(B) than light
(C) being light
(D) light
B
 
10. For any adhesive to make a really strong bond, _____ to be glued must be absolutely clean and free from moisture or grease.
(A) and surfaces
(B) when surfaces
(C) the surfaces
(D) surfaces that
C
 
11. Although still underwater, Loihi Seamount, the newest Hawaiian island, _____ closer to the surface by frequent volcanic eruptions that add layers of lava to the island.
(A) brought
(B) to be brought
(C) being brought
(D) is being brought
D
 
12. _____ unstable and explodes as a supernova is not known.
(A) For a star to become
(B) How a star becomes
(C) A star becomes
(D) That a star is becoming
B
 
13. Not until linoleum was invented in 1860 _____ hard - wearing, easy - to - clean flooring.
(A) any house did have
(B) did any house have
(C) house had any
(D) any house had
B
 
14. Hiram Revels, the first Black member of the United States Senate, served as senator from Mississippi, an office _____ he was elected in 1870.
(A) which
(B) to which
(C) and which
(D) being which
B
 
15. Oceans continually lose by evaporation much of the river water _____.
(A) to constantly flow into them
(B) is constantly flowing into them
(C) constantly flows into them
(D) constantly flowing into them
D
 
16. Because of it consists only of a relatively short strand of DNA protected by a shell of
A B C
protein, a virus cannot eat or reproduce by itself.
D
A
because(because of
 
17. The oxygen in the air we breathe has no tasted, smell, or color.
A B C D
C
tasted(taste
 
18. In 1977 Kathleen Battle was hired by the New York Metropolitan Opera, Where her
A B