(A) that institutes
(B) while instituted
(C) was an institution
(D) an institute
12. Early forms of life on Earth, ____ in the absence of oxygen, required elements such as sulfur instead.
(A) which lived
(B) whose life
(C) lived
(D) were living
13. People in prehistoric times created paints by grinding materials such as plants and clay into powder ____ .
(A) water to be added
(B) for adding water then
(C) and water added
(D) and then adding water
14.Often very annoying weeds, ____ and act as hosts to many insect pests.
(A) that crowd out less hardy plants than goldenrods
(B) crowding out less hardy plants by goldenrods
(C) the goldenrods crowding out of less hardy plants
(D) goldenrods crowd out less hardy plants
15. Starting around 7000 B.C., and for the next four thousand years, much of the Northern Hemisphere ____ temperatures warmer than at present.
(A) with experience of
(B) experienced
(C) experiencing
(D) experience
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