I can provide some general guidance on how to approach answering those questions, but specific answers would depend on additional context or material you've studied. Here’s a framework for each question:

1. **What does Linh do when she sees a new word?**
- Possible answer: Linh might look up the definition, write it down, use it in a sentence, or try to memorize it.

2. **How do they learn to speak English?**
- Possible answer: They might learn through classes, conversations with native speakers, practice, or language apps.

3. **Who is good at English?**
- Possible answer: This could refer to a specific character or person mentioned in your materials, or it might be a general statement based on the context.

4. **How often does John go to the library?**
- Possible answer: John might go to the library daily, weekly, or only during exam periods, depending on his study habits.

5. **Is English necessary for communication?**
- Possible answer: English can be important for international communication, but the necessity may vary by region and context.

Make sure to refer to your specific learning materials or context for accurate answers!