Question

Fill in each blank with an appropriate word .
We walked on ............................ we reached the bridge.​

Answer 1

Answer:

We walked on until/till we reached the bridge.​

Explanation:

This means 'we' kept on walking up to the point where the bridge was. 'Until'  is a preposition that means 'up to the point in time or event mentioned'.

Until and till are almost the same. We could interchange them.

Answer 2

Here is your answer,

We walked on "till" we reached the bridge. //Inverted commas for highlighting the answer