Choose the correct answer

I can't see the full details of the text or answer the questions directly. However, I can help guide you on how to choose the correct answers for the given sentences.

For each blank:
1. **Ever, never, or yet** often relate to experiences or time up to now. Use "ever" for questions, "never" for negative statements, and "yet" for things that haven't happened by a certain time.
2. **Since, for, or during** generally relate to time periods: "since" for specific starting points, "for" for durations, and "during" for events happening in a time frame.
3. **However, therefore, or although** indicate relationships between clauses: "however" for contrast, "therefore" for conclusions, and "although" for concessions.
4. For measurements of quantity (many, much, a lot), remember that "many" applies to countable nouns, "much" to uncountable nouns, and "a lot" to both.

If you provide more context or specific sentences, I can help further!