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17. among -> between
18. are -> is
19. long -> length
20. are understanding -> understand
21. it -> them
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TK
Individual organisms live together in an ecosystem and depend on one another. … Some organisms can make their own food, and other organisms have to get their food by eating other organisms. An organism that must obtain their nutrients by eating (consuming) other organisms is called a consumer, or a heterotroph.
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1) He..........to be an astronaut in the future
A. like B.would like C. want
2)My father is...........engineer and he works in.......office.
A. a/an B. an/an C.an/a
3)..................would you like to be a pilot?
A. Where B. What C. Why
4)Yesterday I..... to the English Speaking Club with may friends.
A. went B.go C.going
5)Linda love children...........she want to be a teacher.
A. and B.but C. because
A
A