Problem: How does the sentence end?

If you're learning a foreign language, I recommend the tapes over the books since the 
Answer: tapes are more helpful.

Problem: How does the sentence end?

the nurse decided to provide care to the beds instead of the floors, since the 
Answer: floors were clean.

Problem: How does the sentence end?

The college replaced the stained carpet with new hardwood in the common area, the 
Answer: hardwood was trendy.

Problem: How does the sentence end?

The quiche was taken out of the fridge and put into the oven because the 
Answer:
oven was building it.