Thrifty means using money and resources carefully and avoiding waste. Economical captures that idea precisely: it describes someone who makes smart, cost-conscious choices and gets good value without overspending. In practice, being thrifty might involve shopping sales, comparing prices, and planning purchases to save money, which is exactly what being economical emphasizes. The other words describe different faults: wasteful points to spending a lot and wasting resources; extravagant suggests spending far more than is necessary; careless implies a lack of attention or concern, not necessarily about money. So the closest synonym is economical.

The main idea being tested is the thesis: the clear, specific claim that states what the essay is arguing or proving. The thesis sets the purpose and direction for the whole piece, so every paragraph and piece of evidence ties back to it. A strong thesis is debatable and concise, guiding the reader to what will be supported with reasons and evidence. For example, in a persuasive essay about uniforms, the thesis might say that requiring uniforms improves discipline and academic focus, and the rest of the essay would provide reasons and data to back that up. While a key idea can be an important point in the text, it’s not necessarily the central claim of the whole argument; structure refers to how the essay is organized, not to the claim itself.

Cause and effect is about a link where one thing happening makes another thing happen. The best description is that one event leads to another outcome, showing how the first event (the cause) brings about the second event (the effect). For example, turning on a heater can cause the room to warm up. If two events occur independently, they aren’t connected in a way that one causes the other. A sequence that repeats identically describes a pattern or repetition, not a cause-and-effect relationship. A statement of fact without consequences doesn’t demonstrate any result that follows from something else.

Exposition is the part of a text that provides the background and necessary setup so you can understand what comes next. It introduces the setting, the characters, and the initial situation, laying out the information readers need to follow the story or argument. Think of it as the opening groundwork that makes the rest of the text make sense. For example, in a story, the exposition might tell where and when the events take place and who the main characters are, so you know why the ensuing actions matter. In an essay or article, it might present the topic and key terms or context, so readers understand the upcoming points. Background information is related, but the formal term used for this introductory material in fiction and nonfiction is exposition. Narration refers to the telling of events themselves, and a conclusion is the ending that wraps things up.