Here are the answers based on the provided text:

1. **Digital devices are described in the passage as**
**b. helpful educational materials.**

2. **What is one advantage of using Skype in education?**
**d. It enables collaborations across classrooms and schools.**

3. **According to the passage, artificial intelligence**
**d. is feared as a potential threat to teachers.**

4. **The phrase "sleeping giant" in paragraph 3 means**
**a. one that has great but unrealized power.**

5. **How have digital devices impacted classrooms?**
**b. Smart boards and laptops appear in many classrooms.**

6. **Which of the following statements is NOT true?**
**d. Social channels prevent educators from using digital devices effectively.**

These answers align with the context of the passage provided.