Exercise 2: Choose the odd one out.

A.rubbish
B.litter
C.envelope
D.garbage

Exercise 3: Choose the best option A, B, C or D.
If we ……. waste paper, we will save a lot of trees.
A.repeat
B.remind
C.recycle
D.remark

Exercise 3: Choose the best option A, B, C or D.
What does “reduce” mean?
A.using something again
B.using something less
C.using something more
D.collect something

Exercise 3: Choose the best option A, B, C or D.
Polluted water can make fish …………. .
A.live
B.grow
C.sleep
D.die

Exercise 3: Choose the best option A, B, C or D.
If we plant more trees in the schoolyard, the school will become a ……………………. place.
A.darker
B.dirtier
C.greener
D.more polluted

Exercise 3: Choose the best option A, B, C or D.
Do you think we should put a …………….. bin in every classroom in order to keep it clean?
A.reusable
B.recycling
C.recycled
D.recyclable

Exercise 3: Choose the best option A, B, C or D.
My brother and I will give last year’s clothes to ……………. instead of throwing them away.
A.shop
B.charity
C.people
D.survey

Why are bitcoins of great concern to governments?
A.Because most of bitcoin owners are hackers.
B.Because bitcoins may be used in illegal transactions.
C.Because the value of bitcoins is fluctuating wildly.
D.Because bitcoins will eventually replace national currencies.

What is the passage mainly about?
A.The future of bitcoins in the real world
B.A new kind of currency in the virtual world
C.A way of doing business in the virtual world
D.An alternative to bitcoins created by Nakamoto

The word "minuscule" in paragraph 3 is closest in meaning to _________.
A.small
B.considerable
C.increasing
D.minimal