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18 tháng 1 2022

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