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Find the underlined part that needs correction in the following questions.

25. Because of my sister's practices writing every day, her language skills are improving noticeably.
A. Because of
B. practices
C. language
D. improving

26. You can use an online dictionary to look over the words you don’t know the meaning of.
A. use
B. dictionary
C. look over
D. know

27. Some of my friends choose leave Vietnam and study in a foreign country.
A. of
B. friends
C. leave
D. foreign