Question: The spy discovered the enemy's location. What is the cause?

Answer: The spy bugged the enemy's phone.


Question: I was confused by the professor's lecture. What is the effect?

Answer: I asked the professor questions.


Question: The photo albums collected dust in the attic. What is the cause?

Answer: They remained untouched for years.


Question: I rubbed sandpaper on the wood. What is the effect?

Answer:
The wood became smooth.