Consider which verb form is more likely and why, and underline it.

I heard the tyre ____ and then the lorry skidded across the road.
1. burst
2. bursting
Karl noticed someone ____ him from an upstairs window.
1. watch
2. watching
She felt the bee ____ her just before she brushed it off her arm.
1. sting
2. stinging
With a good telescope you can see the eagles ____ their chicks in the nest.
1. feed
2. feeding