In most parts of the world, many students help their school make less pollution. They join in “environment clubs”. In an environment club, people work together to make our environment clean.
Here are things students often do：
Turn off the water! Do you know that some toilets can waste twenty to
forty tons of water an hour? In a year, that would fill a small water! In environment clubs, students mend those broken toilets.
No-car day. On a no-car day, nobody comes to school in a car-not the students and not the teachers. Cars give pollution to our air, so remember: walk, jump, bike or run.
Use your legs! It’s lots of fun!
No-garbage(垃圾) lunches. How much do you throw away after lunch?
Environment clubs ask students to bring their lunches in bags that can be used
again. Every week they will choose the classes that make the least garbage
and report them to the whole school.
We love our environment! Let’s work together to make it clean!
【小题1】 After mending the broken toilets, they save      .

根据句子意思，用所给单词的适当形式填空。
【小题1】The ____________(high) of the new building is over 400 meters.
【小题2】On Christmas Eve, the Santa Claus hides gifts _____________ (secret) into kids' stockings.
【小题3】— How many times should I take the pills, doctor?
— ___________ (two) a day, please.
【小题4】— Shall we meet at 9:00 at the school gate tomorrow morning?
— I hope we can make it ___________ (early). What about 8:30?
【小题5】Mr. Li's report gave us a deep _____________ (impress) .
【小题6】Remember __________ (turn) off the lights when you leave the room, please.
【小题7】The film was __________ (base) on Chinese history in the 1940's.
【小题8】Look! Can you see a kite _____________ (fly) in the sky?
【小题9】The boy is a good swimmer. He can swim ____________ (cross) the wide river.
【小题10】Many students find it ____________ (bore) to play computer games all day.

Remember to         your mobile phone when the plane takes off.　　

A. turn on       B. turn down       C. turn off　　

Have you ever hoped a toy balloon? They are very light. But there are much bigger balloons can fly very high up in the sky. They are big enough to carry people. They are called hot-air balloons.
To make a hot-air balloon go up, turn on the burner(燃烧器). That will make the air inside the balloon hotter. Then the balloon will go up.
To make the balloon go down, turn off the burner. The air inside the balloon will get cooler. Then the balloon will go down. Underneath(在….下面) the balloon there is a large basket. That is where the pilot and the passengers go.
The burner is just above the basket. You can stand in the basket and turn the burner on and off. The balloon will go where the wind is blowing the right way! Do you want the balloon to go somewhere special? First make sure the wind is blowing the right way!
People have been flying in hot-air balloons for over two hundred years. Before planes it was the only way of flying. Today people fly in hot-air balloon for fun. Some people like to race hot-air balloons.
【小题1】A hot-air balloon is ____