Saving energy is very important for protecting the environment and our future. Firstly, we should turn off the lights, fans, and other electrical devices when they are not in use. Secondly, we should make use of natural light. Finally, using energy saving bulbs at home is also an effective way to reduce electricity use. In short, if everyone follows these simple idea, we can save more energy and make our planet cleaner and greener.

1. Students should use online resources for learning.

2. Although she didn't speak English well, she traveled alone to the UK.

1. The students are doing a science experiment in the lab now.

2. Space travel will become affordable for everyone in the future.

3. You shouldn't stay up late to watch TV programmes.