20 adverb modifying go.
21 Reading a book is a gerund phrase subject of the linking verb is. [It's the only phrase in the sentence].
22 Of the United States is an adjective phrase modifying president.
23 To get. Infinitive It's acting like a noun
24 Participial phrase modifying dog
You don't list any choices, but colloquialisms are used in informal speech. Hope it helps.
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C. How long does it take to travel from the Earth to the moon?
This is the weakest research question because it can be easily answered. According to a 2 second Google search, it takes about 3 days for a spacecraft to reach the moon from Earth. This question does not allow for a lot of research for development into an essay. Options A, B and D all have a variety of possibilities that would allow for a multi-paragraph essay with significant topic development.
