[Q]: How does the sentence end?

The physicist drained the beaker into the pan until the 

[A]: pan was full as part of an experiment.


[Q]: How does the sentence end?

While on the side of the road, Erin changed a tire for Patricia since 

[A]: Erin had experience doing this.


[Q]: How does the sentence end?

The many found many aquamarine gemstones in the mine, but very few gold nuggets since the 

[A]:
nuggets were rare.