The TV is on, please don’t forget __________ when you leave.

A. to turn off it B. to turn it off

C. turning off it D. turning it off

Doctor Ray, as well as other scientists __________ trees for nearly 15 years, but they know only a little about them.

A. study B. studies C. has studied D. have studied

This sign warns the people who study in the library __________.

A. don’t speak loudly B. not speak loudly

C. to not speak loudly D. not to speak loudly

They had to ________ the meeting hurriedly because time was up.

A. hold B. contain C. conclude D. take place

_______ nice weather it is to have a picnic!

A. What B. What a C. How D. How a

I wonder __________.

A. if I can keep this book for 5 days

B. can I keep this book for 5 days

C. how long can I keep this book

D. that I can keep this book for 5 days

-----Happy birthday to you, Judy! Here is a gift for you.

-----___________.

A. My pleasure. B. Thank you.

C. You’re welcome. D. The same to you.

----I’ve got the first prize for the English speech contest. How happy I am!

---- ___________.

A. Never mind. B. That’s all right.

C. Thank you. D. You deserved to win.

Complete the following passage with the words or phrases in the box. Each can only be used once. （选择与下列各句中划线部分内容意思相近的单词或短语，用A, B, C…或G等表示):

The electricity in your home is from power stations. Power stations usually ____1.___ coal, oil or gas to make electricity. These power stations pollute our air.

Here at the Earth Friends centre we get our energy from the sun, water and wind. They give us energy every day and they’ll never_____2.____. This is renewable energy. Solar panels (太阳能板) and water and wind turbines（涡轮机） are clean and so are ____3.____ for our planet. They are environmently friendly.

Solar panels catch the sun’s energy and turn it into ecletricity. The electricity is stored in batteries _4.________ we use it. You could put solar panels on the roof of your house and make your own clean electricity.

Moving water turns the turbine and produces electricity. Hydro electric power stations（水力发电站） on rivers work in the same way but they are much ____5.____.

Windmills(风车) have existed for hundreds of years. In the past, farmers used them to make flour. Modern ones are used to produce electricity. The wind moves the turbine just ____6._____ the water moves it to make hydro electric power.

So now you know how to save energy at home and how we can make electricity every day without polluting our Earth.

Complete the sentences with the given words in their proper forms. （用括号内所给单词的适当形式填空，每空格限填一词）：

1.Please help _________ to the cake, everybody. (you)

2.It’s a good __________ to take fewer things with us. (choose)

3.We all know that trees can produce oxygen to keep people _________. (live)

4.Joyce sat __________ on a sofa watching a cartoon. (comfortable)

5.The student has ___________ to receive the invitation from the big company. (decision)

6.We all need your __________ about the things happened yesterday. (explain)