We spend about one third of our lives sleeping. Yet many people still do not take sleep seriously. Studies show that enough sleep can improve memory and help us stay in a good mood. Without it, we may find it hard to focus during the day. Doctors suggest that we relax properly before going to bed.
Cycling is one of the cleanest ways to travel. It causes no air pollution and helps reduce traffic jams. Besides, riding a bike is a good way to keep fit and can save a lot of money on transport. More and more cities are now building special lanes for cyclists.
The Green Tower is a famous building in our city. Its walls are covered with plants, and its roof collects rainwater for daily use. Solar panels provide most of its electricity. Experts say such buildings can greatly save energy.
Libraries have changed a lot over the past twenty years. Today many of them offer free Wi-Fi, digital books and online reading rooms. Some people worry that traditional books will disappear, but most librarians believe digital libraries are only a useful addition rather than a replacement.
Last summer I took part in a volunteer project. At first I thought it would be boring, but soon I changed my mind. We went to a poor village to help the children there. They were very happy to see us. We taught them English and told them many stories. This experience taught me that giving is better than receiving.
My grandpa loves sports very much. Every morning he gets up early to do exercise. When he was young, he was a famous runner. Now he is over seventy, but he is still in good health. He often says that exercise can help us stay young. I hope I can be as healthy as my grandpa when I grow old.