Ⅳ. Listen and judge. (听录音，判断下列句子与你所听内容是“T”否“F”相符。)
(
F
) 1. We are running out of energy. But it's not too late.
(
F
) 2. Mike always sets his air conditioner to $20°\mathrm{C}$ or more in summer.
(
T
) 3. To save water, we should wash all our dirty clothes together.
(
F
) 4. We can recycle old bottles.
(
T
) 5. Green energy is clean and good for Mother Earth.
答案：1. F 2. F 3. T 4. F 5. T
Ⅴ. Listen and write. (听录音，根据所听内容补全短文，每空1词。)
Hi, everyone. I'm Amy. Today I want to talk about how to save 1.
water
.
First, we can take a 2.
quick
shower. It's easy to do in our lives. Second, we shouldn't wash our dirty clothes 3.
one
at a time. Third, we can 4.
reuse
the water after washing fruit and vegetables. Let all of us try to save 5.
energy
and save our Earth!
答案：1. water 2. quick 3. one 4. reuse 5. energy
Ⅵ. Read and choose.（读一读，选择正确的选项补全句子。）
A. unplug the computers B. work on the project C. reduce energy use
D. recycle bottles and bags E. make a difference
1. Turning off lights and TVs helps
C
at home.
2. Even small changes can
E
to our Mother Earth!
3. Before leaving home, we always
A
to save electricity.
4. Our science class will
B
about saving trees next week.
5. We should
D
. We can use them again.
答案：1. C 2. E 3. A 4. B 5. D
Ⅶ. Read and write. (根据句意，用所给单词的适当形式填空。)
1. I think we can use LED
lighting
(light). It is a good way to use less energy.
2. Running water can make
electricity
(electric).
3. Wind power, solar power and water power are three
types
(type) of energy.
4. Let's find out more
useful
(use) ways to save energy.
5. We use green energy
to heat
(heat) our homes.
答案：1. lighting 2. electricity 3. types 4. useful 5. to heat
