The betel nut（槟榔）grows in different parts of Asia, including the Philippines, India and Japan. The betel nut tree grows all year round, and it is     1     that people began chewing on this nut as early as 504 B.C.

In parts of South and Southeast Asia, chewing a betel nut is as common as     2     a cup of coffee or smoking a cigarette. Chewers’ mouths turn blood-red as the juice runs between their     3     and builds up in their mouths.

It is reported that almost a     4     of the whole world enjoy chewing the betel nut, with most in Asia. Visitors to Myanmar, for example, are sure to     5     betel nut stands（货摊）on almost every corner in Yangon.

Chewing betel nuts for long periods has been shown to be harmful, however. The red juice can cause one’s teeth to become first red, then brown, and     6     black. There are also more serious consequences（后果）of chewing the nut too often. Chewing the hard nut daily can cause the roots of the teeth to break, and those who chew betel nuts are more likely to get gum disease and bacterial growths in their mouths     7     those who do not. Just as cigarettes are addictive（致瘾的）, so is the betel nut, making it     8     to break the habit once you fall into it. Oral cancer can also be a result of chewing,     9     the betel nuts contain carcinogens（致癌物）. But many users do not realize that this is the result of chewing betel nuts.

While some people may try to chew betel nuts out of curiosity（好奇心）, it’s best to give up     10     idea for health reasons.

Last December, three Shenzhou-13 astronauts, Ye Guangfu, Wang Yaping and Zhai Zhigang, gave their first class from China’s Tiangong space station.

During the nearly one-hour class, Ye     1     the students how he turned around his body in space. He also explained why it is impossible for astronauts to walk in space like they     2     do on Earth. Wang introduced     3     they lived and worked in space and did some interesting experiments（实验）. In one experiment, she made a small water film（水膜）and     4     a pink folded paper flower on it. Soon the flower unfolded and blossomed（开花）. “I made the flower with my daughter while on Earth and I think of     5     when I see it. Students, all of you are flowers of our country. I hope your     6     can blossom like flowers,” Wang said. Zhai played a cameraman’s role during most of the     7    .

Over 1,000 teachers and students took part in the video communication     8     the astronauts. A middle school student from Hong Kong said she was most interested in Wang’s experiments. They     9     showed her how different it is in space. A teacher said, “The class has increased students’ interest in space science. Also, they feel     10     of our country as they see how fast China’s aerospace industry has developed.”

What a great class!

Each nose is special in its own way. However, according to a study     1     in 2013, the shape of your nose can show a number of things about your personality. The researchers studied almost 1,700 pictures of people’s noses and put them into 14 groups. They examined the nose     2     and posted their findings.

People with long noses have a strong wish to succeed in their professional lives and are hardworking. They want things to be done     3     and spend much time on their work. And they usually put their professional life first and their     4     life second. People with shorter noses     5     about others and are true to friends. They value     6     more than anything else and they would rather be happy in their family than have a successful professional life. People with pointy noses can give great advice on money. They usually use their money very     7    . Big nostrils (鼻孔) are a sign that someone likes to spend money rather than save it. And small nostrils show a strong     8     that relationships and family are important.

Apart from personality, the shape of one’s nose can also show one’s     9     living place. For example, people from Africa usually have wider nostrils and a wider nose bridge, while people from Asia usually have a smaller nose bridge and narrower nostrils. The shape of one’s nose can also influence their health. People with a deviated septum (偏曲中隔) may experience breathing     10    .

“Happy Weekend” is a music band （乐队）. There     1     four children in the band—two girls and two boys.     2     is the band called “Happy Weekend”? Because they always play music     3     weekends. The band is going to Simon’s school tomorrow. To     4     them, Simon needs to learn about them first.

Lisa is a beautiful girl with big eyes. She has long straight hair. Lisa is good at playing the guitar and she is also the     5     of the band. She practices     6     the guitar and singing every day. Jerry is a cool boy. His     7     is round. He has short black hair. And he is of medium build. He plays the piano very well. Maria is a tall and thin girl. She has short curly hair. She is     8     good at playing the guitar. And she sometimes sings with Lisa. Jimmy is a boy of medium height. He is very     9     . Lots of children like him. He plays the drums in the band. He has short black hair. He likes to     10     a hat.