You can ride your bike to school, but remember to be careful {#blank#}1{#/blank#} .　　

This magazine isn't popular with the students though it{#blank#}2{#/blank#}  every week.

It's difficult{#blank#}3{#/blank#}  both the old and the young about the program at the same time.

The kids clapped and shouted {#blank#}4{#/blank#} when the actor appeared.

Though he is very busy, he goes to the movies to relax{#blank#}5{#/blank#} 

The children are interested in playing the piano, so they need more{#blank#}6{#/blank#} 

The visitors {#blank#}7{#/blank#}  not to swim in this river for several times.

There are no students in the classroom. They {#blank#}8{#/blank#}  on the playground.

Thank you for{#blank#}9{#/blank#}  the museum. We've learned a lot.

You must do more exercise, {#blank#}10{#/blank#}  twice a week.

    The summer holiday was coming but Zach was a little sad. He would have to move {#blank#}1{#/blank#} the holiday, leaving his friends and his tree house. The tree house was Zach's favorite place to go to when he wanted to be alone. He also liked {#blank#}2{#/blank#} his friends there. They would play for {#blank#}3{#/blank#}.

    Zach told his mom, "I don't want to move. I'm going to miss my friends. I'm also going to miss my tree house. I want to take it with me." "Zach, but we have to {#blank#}4{#/blank#} your father's changed his job. He is already {#blank#}5{#/blank#} waiting for us. You will have a much {#blank#}6{#/blank#} bedroom, and you will meet new friends at your new school," {#blank#}7{#/blank#} his mom. Zach wasn't so sure.

    When Zach and his mom arrived, Dad took Zach to the backyard. There, Zach saw a big tree house. "Wow!" Zach shouted. "This is great!" All of a sudden, Zach heard a {#blank#}8{#/blank#} voice. "Are you moving in? My name is Joey and I live next {#blank#}9{#/blank#} Can I have a look at your tree house?"

    "I think I'm going to {#blank#}10{#/blank#} it here after all!" Zach told his mom and dad that night.

    The post office has plenty of work to do. It deals with thousands of letters every day. Let's follow a letter all the way across America.

    Julie lives in New York. She wrote a letter to Dave in Oregon. Julie put the letter in the mailbox on Monday night. On Tuesday morning, a truck {#blank#}1{#/blank#} at the mailbox. The postman put the letters into a large bag and took the bag to a post office in New York.

    On Tuesday afternoon the letters were sorted(分类) . Post codes were used to sort the mail. A machine {#blank#}2{#/blank#} a letter and held it. A worker read the post code.

Then the worker pushed five buttons on another machine in one second. After that, the machine put the letter in a box. By Tuesday night the box was on a truck. The truck went to the airport. An airplane {#blank#}3{#/blank#} for Oregon on Wednesday morning.

    Julie's letter went on the airplane.

    By noon the letters were in an airport in Oregon. Mail trucks then took them to post offices. One of these was in Dave's town. On Wednesday night people in Dave's town sorted the letters by street {#blank#}4{#/blank#}.

    On Tuesday morning the postman for Main Street picked up his pile of letters.

    He sorted all of them by street number before {#blank#}5{#/blank#}. The people at 1 Main Street got their mail first. Dave lived at 221 Main Street. He got his letter before lunch.