8 Smoke particles and other air pollutants are often trapped in the atmosphere, thus forming smog.
A caught
B burned
C dirtied
D covered
9 Every year each household in the United States discards approximately a ton of trash.
A filler
B garbage
C paper
D fuel
10 The rainfall of the Hawaiian Islands varies tremendously according to their topography and orientation to the prevailing winds.
A seasonably
B surprisingly
C greatly
D inversely
11 Fine freshwater pearls are found in the main stream and the tributaries of the Mississippi River.
A banks
B deltas
C branches
D currents
12 The flower bud of a water lily opens at sunset since its opening is triggered by the decreased light.
A alleviated
B endured
C set off
D covered up
13 Tryouts for community orchestras are frequently judged by committees.
A Advertisements
B Auditions
C Performances
D Novelties
14 A turbulent storm was a major factor in the defeat of the Spanish Armada.
A noxious
B violent
C mysterious
D pathetic
15 Light rays are turned aside by the intense gravitational field surrounding a black hole.
A heightened
B deflected
C rotated
D created
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