No, it is not a preposition. Throwing is a verb form or gerund (noun).
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No, it is not a preposition. Increase can be a verb or a noun.
No. Almost is an adverb. It is not used as a preposition.
No. The word much can be an adjective or an adverb. But it cannot be a preposition.
It is a preposition. It cannot stand alone to modify a verb.
No, it is not a preposition. The word top is a noun, verb, or adjective.