Final answer:
The best word to complete the sentence 'Me gusta las artes marciales' is 'practico'
Step-by-step explanation:
The best word to complete the sentence 'Me gusta las artes marciales' is practico. In Spanish, the verb 'gustar' is used with an indirect object pronoun and the verb 'practicar' means 'to practice'. Since the subject is 'me' (which implies the first person singular), we use the first person singular form of the verb 'practicar', which is 'practico'.
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