Problem: How does the sentence end?

They had to check the condition of the water again after fixing the pH and alkaline levels because the 
Answer: alkaline had increased.

Problem: How does the sentence end?

The shampoo worked a lot better than the soap because the 
Answer: shampoo was from a well known brand.

Problem: How does the sentence end?

For the presentation, Kyle was more nervous than Ian because 
Answer: Ian had a shorter speech.

Problem: How does the sentence end?

Joseph had a new, modern house designed by Robert because 
Answer:
Robert was a very talented architect.