More recently, most Americans remember what they were doing when the World Trade Center in New York was taken down by terrorists. It is one of the {#blank#}1{#/blank#} events in American history. Even the date—September 11, 2001—has {#blank#}2{#/blank#} to most Americans.

    This was a day Peter Hunt will never forget. In May 2001, he {#blank#}3{#/blank#} a job in the World Trade Center. On September 11, 2001, he arrived at his building at around 8:30 a.m. He was about to go up when he decided to get a coffee first. He went to his favorite coffee place even though it was two {#blank#}4{#/blank#} east from his office. As he was waiting in line with other office {#blank#}5{#/blank#}, he heard a loud sound. Before he could join the other people outside to see what was going on, the first plane had already hit his office building. They stared in {#blank#}6{#/blank#} at the black smoke rising above the burning building. He felt lucky to be alive.

    Kate Smith will never forget the date, too. Now she still {#blank#}7{#/blank#} working in her office near the two towers. "My friend Mike shouted {#blank#}8{#/blank#} that a plane just hit the World Trade Center! I didn't believe {#blank#}9{#/blank#} at first. But then I looked out of the window and realized that it was {#blank#}10{#/blank#}. I was scared and I could hardly think clearly after that."

    September 11, 2001—the date alone means something to most people in the US.

    In the {#blank#}1{#/blank#}the moon is not as big as the earth—the {#blank#}2{#/blank#} we live on. And they are far away from each other in the Galaxy. In the Galaxy there is a large {#blank#}3{#/blank#} of stars and planets.

    In 1969, three American astronauts {#blank#}4{#/blank#} the moon in a spaceship, but {#blank#}5{#/blank#} of them {#blank#}6{#/blank#}any living things there. It is very hot in the day and very cold at night. And there is no air there. The {#blank#}7{#/blank#} on the moon is {#blank#}8{#/blank#} for anything to live on. Maybe Mars can have life in the future, but we're not sure {#blank#}9{#/blank#}.

    Everything on the moon is much lighter. Walking on the moon is like jumping and flying. So you can jump much higher on the moon than on the {#blank#}10{#/blank#}.

A: Look! There is a red hat on the desk. Whose is it?

B: Is it Helen's?

A: No. It can't be hers. She never {#blank#}1{#/blank#} hats.

B: It might be Cindy's. She likes hats. And red is her favorite color.

A: Let's ask her. Cindy, is this your hat?

C: No. {#blank#}2{#/blank#} is at home, I don't wear it today.

A: Well, it can't be Cindy's. She says hers is at home.

B: Is it Bill's?

A: Let's ask him. Bill, is this red hat {#blank#}3{#/blank#}?

D: No, it isn't.

A: It doesn't {#blank#}4{#/blank#} to Helen, Cindy or Bill. Then whose red hat is this? Is it Eric's?

B: Oh! It must be his. I {#blank#}5{#/blank#} him wear it yesterday.

Joy: Hi, May, are you free next week?

Mary: Hmm, next week is quite {#blank#}1{#/blank#}for me.

Joy: Really? How come?

Mary: I have dance and piano lessons.

Joy: What kind of dance are you {#blank#}2{#/blank#}?

Mary: Oh, swing dance. I have class {#blank#}3{#/blank#} a week, every Monday.

Joy: How often do you have piano {#blank#}4{#/blank#}?

Mary: Twice a week, on Sunday and Friday.

Joy: Well, how about Tuesday?

Mary: Oh, I have to{#blank#}5{#/blank#}tennis with my friends. Do you want to come?

Joy: Sure!