13. Over millions of years, the forceful rush of water can cut deep canyons into dry desert rock.________ Grand Canyon, in Arizona, for example, was carved by water. a. A b. An c. The d. no article 14. Mr. Pike works hard and spends more economically to make ________ for his old age.a, provide b. provision c. provider d. provident15. Only a very delicate thermometer can measure such tiny changes in________a. water b. temperature c. current d. marine16....
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13. Over millions of years, the forceful rush of water can cut deep canyons into dry desert rock.________ Grand Canyon, in Arizona, for example, was carved by water.
a. A b. An c. The d. no article
14. Mr. Pike works hard and spends more economically to make ________ for his old age.
a, provide b. provision c. provider d. provident
15. Only a very delicate thermometer can measure such tiny changes in________
a. water b. temperature c. current d. marine
16. They spent their childhood in a tiny fishery village by the sea.
a. small b. big c. large d. enormous
17. Seventy-five percent of the earth ________ are covered by seas and oceans.
a. face b. flat c. resurface d. surface
18. Oil spills are a great a great ________ to the undersea world.
a. threat b. threaten e. threatened d. threateningly
19. Her work has enormously contributed ________ the charity collection.
a. for b. on c. to d. in
20. John’s father is a ________ scientist. He studies life in the sea.
a. marine b. undersea c. submarine d. organism