Here are the correct answers for the fill-in-the-blank questions:

1. **B. save** - I should turn off the lights before going to bed to **save** electricity.
2. **A. communication** - People need to find some other means of **communication** to deal with traffic jams.
3. **A. Wind** - **Wind** is a non-renewable energy source.
4. **D. pollution** - A teleporter is eco-friendly, so it doesn’t cause **pollution**.
5. **C. solar panels** - We should put **solar panels** on our roof for the heating and hot water.
6. **B. runs out** - When your electric car **runs out**, it will need to be recharged.
7. **A. used** - Many countries in the world **use** wind power on a commercial basis today.
8. **B. will use** - We must **use** the amount of water our family uses every day.
9. **B. increase** - A bamboo-copter runs on electricity, so it is safe for the environment.
10. **A. away** - Ben and I are **away** from the Internet at the moment.
11. **B. surfing** - I **am surfing** the web right now.
12. **A. Do** - **Do** the swans swimming in the lake now?
13. **B. is** - How often **is** your sister ride a skyTran to work?
14. **A. launch** - Look! They **will launch** a new spaceship.
15. **B. are launching** - Normally at this time her brother **is launching** the vegetables in the garden, but today he **is** in the kitchen.
16. **B. water** - “What **is** watering?” or “What **is** cooking?” (Depending on intent: either question is correct.)

Feel free to ask if you need further clarifications!