Smell.

From Twitter

Is that    I smell; is mom   , again?
Is there    here?; I smell   !

Choices:
cooking
fire
cigarettes
smell
someone smoking

The answers are below the images.

Photo: Kevin Elija O’Donnell
Photo: Kevin MCcuthin

Answers And Explanation
Is that ① cooking I smell; is mom ② cooking, again? Cooking is a noun and a verb.
Is there someone smoking here?; I smell cigarettes! Smell is a verb as well as a noun.