People depend on plants. We use plants for food, cloth, houses, and even the air we breathe.

Plants keep our air and water clean. Green plants give 【小题1】 oxygen(氧气). Oxygen is part of the air we breathe.

Plants are also part of the water cycle. 【小题2】 of the water that a plant takes in goes back into the air.

Plants give us a lot of the food on the earth. Fruits, vegetables, and grains come from plants. Without plants, we would not 【小题3】 bread, rice, carrots, apples, oranges, or bananas! Many people are 【小题4】 plants to eat in their own gardens at home. Having your own garden helps the earth as well.

【小题5】 you grow your own fruits and vegetables, you help cut down on 【小题6】 because big trucks don’t need to take your food to 【小题7】. You also help save(节省) more bags because you don’t need to use bags for packing your food. You can just pick it out of the ground or off a plant and put it 【小题8】 a basket!

Trees are an important plant resource. Trees provide wood to build homes and make our lives 【小题9】 than before. Trees are 【小题10】 to make lots of things around your home and at your school. And trees provide fruits that are good for you. Without trees, the earth would be a very different place.

Have you ever walked on the road while playing with your mobile phone? Be careful! It might cause accidents, like hitting a tree. Now, thanks to the development of science and technology, we have a new invention to solve this 【小题1】. It is called a transparent (透明的) screen.

The Android app called Transparent Screen Pro uses the 【小题2】 on your mobile phone. When you are using your phone, this app captures an instant image (捕捉实时图像) and uses it as the background of your screen. In this way it makes your phone look transparent. You can see the road and the street view 【小题3】 as you are texting or reading novels on your phone. You can also make your screen look semi-transparent by changing the settings of the app.

However, this useful app also has its side effect. Many users 【小题4】 that it may be used to peep at (偷窥) others without being noticed. “Imagine you are 【小题5】 the bus at a bus stop,” said a female user, “and the man staring at his phone could be secretly peeping at you!”

As the app becomes more and more popular, it also draws some criticism (批评). Nowadays mobile phones have already taken up too much of our time. Maybe we should move our eyes away from the 【小题6】 sometimes, and take a good look at the real world.

Laughter is good for you, and that’s no joke! A good laugh helps you right away. When you laugh, changes 【小题1】in your body. For example, you take in 【小题2】 air than usual, which is good for your heart. A good laugh increases your heart rate. When you laugh, your brain also releases (释放) chemicals that make you feel happy. Laughing can also make you feel relaxed for up to 45 minutes.

Laughter can 【小题3】 reduce pain. You probably don’t want to chuckle (偷笑) when you’re hurt, but laughter helps the body make its own 【小题4】 medicine. Laughing is also great exercise! Research 【小题5】 that laughing 100 times is as good as riding a bike for 15 minutes.

So why don’t you try laughing out loud every day?