`1,` There are lots of energy sources such as water energy, wind energy,... But the most common energy that I know is solar energy. Solar energy is one of the renewable energy and it reduces electricity bills. It is also diverse applications and low maintenance cost. Technology development is also one of solar energy's advantages, it is advancing and improving, too. But solar energy also has lots of disadvantages like it isn't free and it costs money. It uses a lot of space and solar energy storage is very expensive. Solar energy is also associated with pollution and weather-dependent, although it could still collect energy on rainy or wet days, it affected the solar system's drops.

`LemonXTree`

ĐỀ 2;

IN THE FUTURE, I THINK PILOTLESS HELICOPTER WILL BE USED MORE. IT WILL LOOK LIKE A NORMAL HELICOPTER. IT WILL USE ELECTRICITY.FAN WINGS CAN HELP IT FLY. IT WILL USE ADVANCED TECHNOLOGY. IT CAN TRANSPORT 3 PEOPLE. PEOPLE CAN USE IT IN THE SKY. The people don't need to buy gas but we only can use it when the weather is sunny. This vehicle is not only save energy but it also protects the environment in Vietnam.I HOPE THIS MEANS OF TRANSPORT WILL BE SUCCESSFUL