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Help Mr. Henderson, a rather dramatic chemistry teacher, complete his opening day speech by selecting the correct verbs.
"Welcome to Chemistry! Remember our basic rules. If you mix red and blue liquid, the solution _________________________ purple. That is just a scientific fact. However, if anyone _________________________ my special coffee mug on my desk today, I _________________________ them immediately! And trust me, if I were you, I _________________________ that theory."
The correct answers are turns, touches, will fail, and would not test.
- turns: Zero conditional (If + present, present) is used for general truths and scientific facts.
- touches: First conditional (If + present, will + verb) is used for real, possible future situations. "Anyone" is a singular pronoun, so it takes "touches."
- will fail: The main clause of the first conditional uses "will" + base verb.
- would not test: Second conditional (If + past, would + verb) is used for unreal or hypothetical situations (like "If I were you...").