kèm giải thích 6. Excessive consumption of fast food increases the risk of __________________. (OBESE) 7. People who are interested in exploring new things always want to take __________________ trips. (ADVENTURE) 8. If you are going to Son Doong Cave, you really need to book a __________________ tour because you will easily get lost there. (GUIDE) 9. In some Asian countries such as India, Pakistan, the Philippines and Singapore, English is used as the __________________ language. (OFFICE) 10. The variety of dialects and accents in English is one of the biggest challenges to __________________ English speakers. (NATIVE)