15 câu hỏi
To save electricity, we are cutting down __________ our central heating.
on
up
for
of
A hydroelectric dam ______________ in this area now.
is building
is being built
build
was built
Let’s _________ water by turning off tapes when not using.
save
to save
saving
saved
Deforestation _________ destroying Earth’s plant and animal variety.
are
be
is
being
I_______ in the lounge for ten minutes.
was told waiting
was told to wait
was telling to be waited
was told to be waited
There are about 3,000 plants __________ values as medicines against cancer, AIDS, heart disease and many other sicknesses.
for
in
on
with
Man and most animals need a _____________ supply of water to live.
constant
flexible
polluted
valuable
Both fossil fuel _______ non-renewable resources are very important to our life.
or
and
for
with
__________ we conserve natural resources, they will run out very soon.
If
Unless
Whether
In case
What about ___________ the solution together this afternoon?
find
finding
to find
to finding
Without plants, most water ____________ off as soon as it falls, taking away valuable soil.
would run
will run
running
has run
Recycling is a good way of ___________ the environment.
protecting
damaging
destroying
editing
Each year about fifty hundred_________ of plants and animals are already being eliminated.
damages
floods
species
defence
The students _______to be at school at 8 am.
tell
told
have told
were told
The leopard is _________ the threat of extinction.
in
on
under
below
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