仔细阅读下面的短文，在思维导图的空白处填入恰当的内容。

Carpooling (拼车) for School

    In the US, students often carpool. When your school doesn't have a school bus and your home is not near, you can carpool. Usually three or four students go to school in the same car. Their parents take turns (轮流) in taking the students in their cars.

The students have to be on time, because nobody wants to be late for class. If you are in the car and wait (等) for a friend for a long time, you will be unhappy. Your friends will feel the same way when you let them wait. Students learn a great lesson—to be on time.

① {#blank#}1{#/blank#} ② {#blank#}2{#/blank#} ③ {#blank#}3{#/blank#} ④ {#blank#}4{#/blank#} ⑤ {#blank#}5{#/blank#} 

    Coral reefs(珊瑚礁) are found in warm ocean(海洋）waters all over the world. Coral reefs are important because they are home to many ocean plants and animals. They also help keep the sea clean. As well, they provide（提供）food, jobs and a special place to visit for millions of people all over the world.

    There are three main kinds of coral reefs: fringing reefs, barrier reefs and coral atolls. Coral reefs are formed（形成）by tiny animals called coral polyps.

    When coral reefs are healthy, they keep the ocean environment balanced. But many things that humans do are making the reefs sick. Some reefs are even starting to die.

    We should protect coral reefs and help them become healthy again.

每题答案不超过8个词。