Mr. and Mrs. Black opened a small restaurant. In order to attract (吸引) customers, they put a notice in front of the restaurant that said "Meals on the House for Three Days."

    A foreign student who didn't know much English happened to pass by the restaurant on the second day. It was lunch time and he felt very hungry. "Well, here is a restaurant. I am going to have something to eat."

    He walked towards the restaurant when he saw the notice. "American people are really strange. They even eat dinners on their houses. But how can I get up to the top of the house?" he said to himself.

    He looked around and found a ladder against a tree nearby. He started climbing up. But as he reached the top，he heard someone shouting at him.

    "Hey, what are you doing up there?" Mr. Black shouted at him. Next to him was a policeman.

    "Doesn't your notice say? "Meals on the House for Three Days'? Is it just a joke?" the foreign student answered.

    On hearing this, both Mr. Black and the policeman laughed. "Do you know what ON THE HOUSE means? Look it up in the dictionary," the policeman said.

    "The hound(猎犬)!" cries Holmes. "Come, Watson! Come."

    We run quickly over the moor(荒野). We hear one last cry. A man is lying on the ground. As we approach(靠近) we see the dead body of Sir Henry Baskerville. He is wearing his brown suit.

    "Oh, no!" says Holmes, "This man has a beard!"

    Indeed Selden is dead instead of Sir Henry.

    "So it is all clear to me. I remember that Sir Henry gave his old suit to Barrymore, and Barrymore probably gave it to Selden—his wife's brother."

    "Then Selden is dead because of this suit," says Holmes.

    "Think, Watson! Someone gives the hound some of Sir Henry's clothes—probably the boot from the hotel in London. The hound picks up Sir Henry's scent and runs after this poor man."

    Suddenly we see Stapleton walking towards us. He says, "There was a strange noise. I was worried about Sir Henry. I wanted to check if he was all right."

    "Really?" asks Holmes.

    Stapleton looks at Holmes. "Why, it is Mr. Sherlock Holmes, the famous detective! Can you solve the mystery of the Hound of the Baskervilles?"

    Holmes shrugs his shoulders," We cannot solve every mystery. Anyway I will return to London tomorrow."

    "Oh, will you return to London tomorrow?"

    "Yes."

    So Holmes and I walk off to Baskerville Hall and Stapleton walk to his home.

    Holmes thinks Stapleton is dangerous. But we have no proof that Stapleton is the murderer.

    "There are no marks on Sir Charles's body. We know that he died of fright, but we can't prove anything."

    "Things are becoming clear to me," Holmes says to Sir Henry. "It's a very difficult case. And you must help me to catch this hound."

    We are surprised to see one portrait(画像) of a thin man is Sir Hugo, the first victim of the Hound of the Baskervilles. And he's like both Sir Henry and Stapleton. "Stapleton is a Baskerville," replies Holmes. "So he wants to inherit(继承) the Baskerville fortune, and he…," I say. It's an important clue.

    Jack is in Grade Three now. He is a polite boy and studies hard. He is good at his lessons and can answer all the questions in class. His teachers and classmates like him except Henry. They're deskmates. Henry likes playing and often fails the exams. His father is a dentist (牙医) and makes a lot of money. The boy thinks he lives in the richest family in the town. So he looks down upon (瞧不起) others and laughs at them. Of course he has few friends.

    Jack is busy all the time. His father is a shoemaker. The man works hard but he still can't buy enough food for the family. He tells Jack to help him after school, so Jack has to do all his homework at school.

    One summer afternoon, on his way home, Jack met his sister Lily.

    The girl carried a heavy box in her arms without wearing shoes. Jack carried it for her. Henry saw them and said to Jack, "You father is a shoemaker, but your sister has no shoes!"

    "I don't think it's strange," replied Jack. "Your father is dentist, but your little sister has no teeth!"

    Mary is from the USA. She has two brothers. Now her family are in China. Her father, Mr. Peterson teaches English in Xihu Middle School. And her mother works in the same school. She teaches English, too. Mary goes to school in her father's car with her mother every day.

    Mary is a nice girl student. She can speak a little Chinese. She is very lovely, so she has many Chinese friends. She teaches them English, and they teach her Chinese. Her two brothers are twins. One is Bob, the other is Bill. They look the same. They are only five. So their grandparents look after （照顾） them at home. Mrs. Peterson has many toys for the twin brothers. Bob likes to play with toy cars, but Bill likes to play with teddy bears. They are happy every day.

    If you want to study in a foreign country, you have to think about where to live. Because I'm still too young to rent a flat by myself. I am living with a homestay family in Canada and I feel like I'm part of the family.

    I had a homestay in 2013 for the first time. During that time, I stayed in Ajax, a town in Canada for a week with a homestay family. Carlton lives with his nephew and hisniece-in-law9侄子和侄媳妇）.Carlton drove me to a school to learn about Canadian culture every morning, and he picked me up in the afternoons. Our free time was in the evening. The meals he made for me were delicious and we usually watched a movie after dinner. I couldn't forget the life there although I didn't live there for a long time.

    I'm now living with a Hungarian（匈牙利）family with another Chinese boy. There are two family members — Mrs. Perger and her son, Robert. I've already lived here for nine months. Once, my roommate went running and didn't come back for a long time. Mrs. Perger called him, but he didn't answer the phone. She began to worry about him and cry. Fortunately, he was fine and got back home later. I was deeply moved.

    However, living with a homestay family also has some problems. when you live with a foreign family, you live a lifestyle different from your own family's. It may take you a long time to get used to (习惯于)it.

    Living with a homestay family teaches me how to communicate with different people and what we should do when different lifestyles and cultures meet together.

The first cellphone was invented fifty years ago. The man who built that phone, Martin Cooper, is now 94 years old. He has been called the "father of the cellphone".

In the early 1970s, Cooper worked for American technology company Motorola. At the time, Motorola and other companies were competing(竞争) to create cellphones. Cooper made the first public call with a handheld telephone in New York City on April 3, 1973. The device(设备), called Dyna -TAC, weighed about 1 kilogram and was 28 centimeters long.

He developed the phone with his team at Motorola for over five months. They could only talk on it for about 25 minutes. Cooper noted that such a call time was not a problem, because this phone was so heavy that you couldn't hold it up for 25 minutes. Cooper said, "The only thing that I was worried about: 'Is this thing going to work?' And it did. At the time, we had no way of knowing this was an important moment in history."

Today, the phone allows us to do many things. Cooper said the progress of cellphones is sure to continue long into the future. He thinks future phones will monitor our health at all times and batteries(电池) could even be replaced by human energy . He believes that one day, our phones might be small devices inside our ears.

Cooper has also expressed his worry. "We don't have any privacy(隐私) anymore because everything is now recorded someplace," Cooper said. However, he said hopefully that cellphones will continue to develop in ways that can greatly help humans.