Hurricanes (飓风) are storms. They can cause terrible waves, wind and rain. They happen in the Atlantic Ocean and the Pacific Ocean most of the time

Some ants (蚂蚁) make their homes under a stone. If the weather is warm, you may see many ants under the stone. If the weather is cold, many ants will be in their house under the ground.

Most of the ants are workers. They are very busy. They look for food and take care of the young ants. Each family of ants has a queen ant (蚁后). The queen ant doesn’t work. She is important because she lays eggs (产卵). These eggs will become new ants.

There are many kinds of ants in America. One kind of these is very strong. People are afraid of it and animals are afraid of it, too.

These ants move in groups. They eat all the animals on their way. They can kill and eat elephants. When the ants come near, people leave their homes. But people are sometimes glad after the ants pass through, because they will see no other insects (昆虫) or snakes.

We sometimes call the lion “the king of the jungle (丛林之王)” , because it is stronger and more dangerous than other animals.     16     It is the highest animal in the land food chain (链).

In the sea animals, the shark (鲨鱼) is one of the animals at the top of the food chain. It can swim faster than most other sea animals.     17    

What is at the top of the world’s food chain? People are!     18     We could not run faster than cheetahs (猎豹), but we invented cars and now we can move the fastest. We could not fight better than lions, but we invented guns (枪). Now we can hunt the best.

People’s inventions are clever, but they can be dangerous, too. For example, people invented lactones (内酯), and now they make the air and rivers dirty.     19     Dirty rivers kill fish. The bears cannot eat the fish and they die. If we kill one part of the food chain, other parts also die. Remember that we are also a part of the food chain, so we are in danger, too!     20     We should and we could do something for the world!

When you go on the Internet, you may meet with something or someone you don’t like. Such things or persons may bring you too many _______. They usually make you _______ and unhappy. Do you know how to _______ such Internet problems?

Report them. If someone is _______ the website’s rules and sending you some bad messages, remember to _______ him or her. When you report them, the webmaster will notice them. He will deal with them at once. Then your problem will _______ soon.

Ignore (忽视) them. These people can be bullies. Bullies want to make you _______ and upset. If you ignore them, they will stop playing tricks _______ you. Just be _______ and show that you’re okay. If you have trouble dealing with bullies, you can ________ your parents for help. They have ________ experience than you do, and they can help you deal with them.

Think again. Sometimes you get bad messages. Maybe that’s ________ you sent bad messages first. Think again ________ your comment (评论) was rude or not. If you ________ a mistake, you can delete (删除) it or say ________. Be polite. I’m sure you will be forgiven.

Mobile payment is more and more popular in China. Most of us use our mobile phones while buying almost everything. But for foreign visitors, it may     36     strange. For   example, Tim Smith, Minister of Singapore, first experienced this Chinese payment method. One day Tim was waiting in line to     37     apples in a shop in Shanghai and saw other customers show their phones and take the apples     38     giving money. At first, he was very     39    . Soon after, he realized that they used WeChat Pay.

The popularity (流行) of mobile payment in China has made many foreign countries provide mobile payment services for Chinese     40    . So when Chinese people travel around the world, from a small     41     in the UK to a large supermarket in the US, it’s very     42     to see the green or blue logos (标志).

Mobile payment is now a     43     of everyday life in China, and it’s influencing other countries in the world. But China is the     44     one to use mobile payment. According to Financial Times, “Chinese mobile payment was nearly 50 times greater than     45     in the US last year.”

There are a lot of trees around us. The trees can help to make the air fresher     46     cleaner.     47     can also help to control the weather. They provide (提供) humans     48     food, medicine and other things. Because of the trees, many animals can live     49     the earth. But people often cut trees down in large numbers. The forests     50     becoming much smaller than before, so we should protect them well.