Here are the correct answers for each sentence:

1. **B. catch** - Khmer men teach their children how to catch fish at an early age.
2. **A. traditions** - The elders often pass on their traditions to the young through stories and activities.
3. **D. materials** - The mountain people in the Central Highlands use natural materials to build a Rong house.
4. **A. collect** - Minority women often go to the mountains to collect plants for food and medicine.
5. **C. raise** - Many minority groups raise cows and buffaloes for a living.