[Q]: How does the sentence end?

The excavator was abandoned and they brought in a crane to build the house, because the 

[A]: excavator proved useless to the process.


[Q]: How does the sentence end?

My mom bought me tea that was worse than the coffee, because the 

[A]: tea was bad quality.


[Q]: How does the sentence end?

Tanya showed microscope slides to Rebecca to examine single-celled organisms, as a consequence 

[A]:
Rebecca discovered the wonder of the tiny world.