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
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
