Remember to         your mobile phone when the plane takes off.　　

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

— It's time for the weather report. Could I _____________ the TV, Dad?

— Go ahead, please. I also want to know about the weather for tomorrow.

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

阅读下面短文，根据上下文意义和所给单词首字母，写出标有题号每小题空白处适当单词的完全、正确形式。(每空一词)

    “Global warming is causing hundreds of animals and plants to die or change more quickly than scientists thought，”a new study shows．

     Scientists are s   1   at how fast the things are happening．“I feel as if the world is changing in f   2 of our eyes，”said Douglas，a professor at a university of New York．“It’s not just down the road somewhere．It is just running t 3    us now．”

The study reports that at least 70 kinds of frogs have disappeared．It also says that between 100 and 200 kinds of a  4    living in cold places，such as penguins(企鹅) and polar bears(北极熊)，are in serious d  5   ．

“We are finally seeing some animals and p 6    disappearing，”said Douglas．“Now we can see the problem．It’s here．It’s real．”He found that more and more animals moving n  7    to cooler places and they were accepting the c  8  ．Plants g  9   faster than usual．The number of penguins is dropping quickly in the western Antarctic Peninsula(南极半岛)．Polar bears are dropping in n  10   and are losing weight in the Arctic．

Recently，leaders from more than 180 countries met in Kenya to t  11    about global warming．The leaders agreed o  12  the next steps t0 cut global warming gases (气体)．Germany’s leader said，“We should take action at once．”

What can you do for the world? Little t  13  make a big difference．Make sure to turn off the l  14  ，computer and TV after you leave the r  15   ．Don’t use your f  16   car as often．Ride your bike e  17   day．Plant a tree! Trees make the air c  18   ．In order to save trees，don’t use w  19   chopsticks．Try to b  20  products that are made from recycled things．