1. __________________ in the daytime for most of the year, the groundhog hibernates in a burrow during winter.

(A) Is active
(B) That it is active
(C) Active
(D) While is active

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2. _______________쟧n 1800, Middlebury College is the oldest college in Vermont.

(A) Opened
(B) Opened it
(C) The opening
(D) There was open

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3. __________ served as secretary of war under the Articles of Confederation and also, in George Washington's administration, under the United States Constitution.

(A) When Henry Knox
(B) It was Henry Knox
(C) Henry Knox
(D) Henry Knox, who

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4. ___________ until the twelfth century that the magnetic compass was used for navigation.

(A) Its not
(B) It was not
(C) Not
(D) Was not

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5. _______________ vary greatly in shape and form, depending upon both the growth pattern and the arrangement of polyps within the colony.

(A) Since coral colonies
(B) Coral colonies that
(C) Coral colonies, although they
(D) Coral colonies