6. export 7. flat 8. hard-working 9. reliable 10. old-fashioned f) ineffective g) return h) trendy\(\ni\)) import j) mountainous

Matching:

• 6. export - i) import
• 7. flat - h) trendy
• 8. hard-working - g) return
• 9. reliable - f) ineffective
• 10. old-fashioned - j) mountainous

Note: The matching is based on common collocations and semantic relationships, assuming the given lists are meant to be paired.