Waste can be seen everywhere and it can bring a lot of problems. China is rich in some resources(资源),    we are short of others, for example, fresh water. It is said that we will have no coal(煤) or oil to use     100 years. Also there is not enough food in some areas. So if we keep     our resources, what can we use in the future and    can we move? Think about it, I think we should    “no” to the people who waste things every day.

In our everyday life, we can do many things waste from happening. For example, remember to turn the lights when we leave the room and we'd better use both of paper. Also we should try not to order food than we need and so on. Little by little, everything will be changed, waste can be stopped one day if we do best.

 Indians always shake their heads when they talk to others. It does not have the same meaning as our “    “. If someone wants to visit  India, he should know this or it will give him some     .

 One day, a foreign officer went to India on business. He hired （雇用）a car and an Indian driver. When he told his driver to take him to his office, the driver shook his head at once. The officer   his order and the driver shook his head again. At last, the officer, of course, got   。

“How dare（敢）you refuse my order?” he     , “Drive me to the office at once!”

 The driver answered in a very loud voice too. “Yes, sir.” But to the officer's surprise, the driver shook his head at the same time.

 The car started and the officer was now so surprised that he    say a word. He thought about it for a while and nodded with a smile, " 'No' means 'Yes' here!”

Miss Wang recently had a worrying experience.

One morning, just as she arrived at her, Wang noticed some missed calls from her mother. "It must be something very important," she thought to herself.

 Right away, she called her mother  quite worriedly. To her surprise, Wang found her mother only wanted her charger(充电器), which Wang took to the office by mistake.

When Wang hurried home from her office, she found her mother's  was still 70% charged. And her mother was worried that it would run out of power as she continued using it.

Now Wang realizes the seriousness of the problem. Her mother eight hours a day playing games, reading news and watching short videos online. And her mother has problems like poor eyesight, headache and so on.

This story is not special and Wang's mother is not . She is just one in a growing population of the old who lose themselves in playing with phones. As the old have  chances to join in social activities, a smart phone is the best way to kill time.

But too much time on phone can cause many problems. "Be careful when using your phones,  you will be easily fooled:" Although the old are always warned like this, online frauds (欺骗) still happen to them. Now there are more family problems. Action should be taken.

For the old, they should control their screen time and get enough rest. The young, for their part, should often visit the old, and help them learn more about online safety so that they can themselves. Also, the young can do more activities with the old like talking, walking and traveling, or encourage them to learn something at the universities for the aged.

As students, you should study hard. More importantly, you should study in a smart way. Try these methods below

Spaced Repetition

According to Ebbinghaus, you'll easily if you don't review in time. After you read your study material for the first time, you'd better come back to it 6 hours later, then 24 hours later, 3 days later, 7 days later or even 14 days later and above. Repeat itleast 5 times, and you can almost remember everything.

 Jim Kwik's Technique(方法)

According to Jim Kwik an expert on reading and the memory, the key to understanding your reading material is to ask question. You can put a line down the of a piece of

paper. On the left, take notes of key information, while on the right, write down 3 kinds of questions —how, when and why. Among the questions, the most important is how you can use the key information. Connect it with the knowledge you've known. And think about what real life problems you can solve by using it. This helps to keep the information your mind.

The Feynman Technique

Studies show students can understand what they've learned better when theysomeone else. The Feynman technique includes 4 basic steps. First, study. Second, teach what you've just learned to someone with zero knowledge of the subject inwords. Third, find out which pars you can explain well and which parts you can't go back to the book and try to topic without looking at the book. understand the topic once again. Fourth, repeat the steps above you can explain the