A puff of air to the eye causes a reflexive blink. If you precede the puff of air with a buzzer, eventually the buzzer will cause a blink. In this example, the buzzer begins as the and eventually becomes the

The answer is neutral stimulus and conditioned stimulus, respectively.

Explanation:

In classical conditioning, a conditioned stimulus is associated with an unrelated consequence, called unconditioned stimulus. This produces a reaction known as conditioned response.

The passage illustrates the fact that any neutral stimulus can become conditioned, as long as it's paired with an unconditioned stimulus. For example, instead of a buzzer, the stimulus could have been a coloured light or a different sound. When associated with the puff of air, it would become conditioned.

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you should think about the answers you give and expect the same form your questions.