Question

at last we saw the hikers appear along the mountain ______.
1 exchange
2 ridge
3 current
4 dock

Explanation:

To solve this, we analyze each option:

• "exchange" means a swap, not fitting "mountain...".
• "ridge" is a mountain's top edge, so "mountain ridge" makes sense for hikers to appear along.
• "current" refers to flow (like water/electricity), not mountain - related.
• "dock" is a port structure, unrelated to mountains.

Answer:

1. ridge