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Explanation:
The sentence should be "The cake smells sweet." or "The cake is smelling sweet." The sentence is missing punctuation and capitalizing the beginning letter in the sentence. I would also prefer the first sentence as it has more consistency.
I believe that the best answer for this question is "are." You are referring to two parties here, both the lion tamer and the clowns. This would mean that your applicable verbs must also be plural. Since "are" is the plural version of "is," it is the most suitable word to use in this situation. Hope this helps.