The use of a, an, or the is a signal that a noun is coming.
In the English language, only nouns are preceded by articles. A is used when a noun starts with a consonant (a book, a table, a bottle); an is used when the noun starts with a vowel (an apple, an umbrella, an avocado); the is used when you are referring to a particular thing (The boy I just met is called Mark.)
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Assuming you have scrolling set normally, pressing page up would maoe the page... well.. go up
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D) arrives
Simba arrives tomorrow
Karen was disdaining her thoughts on the political debate.
(Now that I have answered your question can you help me with my current one. Its the most recent one on my profile page thing.)