1. ________ owe much of their success as a group to their unusual powers of migration.

(A) That birds
(B) A bird
(C) The bird
(D) Birds

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1. Fire-resistant materials are used to retard ________ of modern aircraft in case of accidents.

(A) a damage to the passenger cabin
(B) that damages to the passenger cabin
(C) damage to the passenger cabin
(D) passenger cabin’s damages

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1. ________ thirteen states in the original United States.

(A) As there were
(B) There were
(C) Were
(D) So were

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1. The artistic medium of clay is ________ that images have been found near the remains of fires from the last Ice Age.

(A) so old
(B) such an old
(C) oldest
(D) old

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1. A vacuum will neither conduct heat nor ________.

(A) transmit sound waves
(B) transmitting sound waves
(C) sound waves are transmitted
(D) the transmission of sound waves

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1. George belongs to the ________

(A) class of the upper middle
(B) upper middle class
(C) class from the center up
(D) high medium class

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1. ________, the Mauritius parakeet, and the Japanese crested ibis are among (the most endangered of the world’s birds.

(A) Including the Marianas mallard
(B) Being the Marianas mallard
(C) There are the Marianas mallard
(D) The Marianas mallard

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