题目内容
Fuel is (any) substance or material (that reacts) chemically (with) another substance or material to produce (hot).
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Gourds were (introduced) to what is now the southwestern United States by (earliest) peoples (who) migrated north (from) Mesoamerica about 7000 years ago.
Ohio, the center of _________ the Hopewell culture, has the greatest concentration of ancient burial mounds in the United States.
When ______ from milk, the remainder is called skim milk.
________.. including climate, mineral content, and the permanency of surface water, wetlands may be mossy ,grassy, scrubby, or wooded.
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