To snow.
Why? "It's beginning to snow." makes the most sense. "It's beginning snowing." doesn't make as much sense.
Depends on what word is underlined.
<em>Maria </em>is a noun, (<em>will</em>) <em>show </em>is a verb, <em>us </em>is a pronoun, <em>the </em>is a determiner, <em>pictures </em>is a noun, <em>she </em>is a pronoun, <em>took </em>is a verb, <em>while </em>is an adverb, <em>on </em>is a preposition, <em>vacation </em>is a noun.
A globe would show the earth more accurately