If we ______(plant) trees, we _____ (reduce) carbon dioxide in the atmosphere.
plant, will reduce
will plant, reduce
plant, reduce
If we ______(learn) to respect the environment, our planet_____ (be) a better place to live in.
will learn, be
learn, will be
learn, be
If we _____(recycle) paper, we _____(save) our forests.
will recycle, save
recycle, save
recycle, will save
If we_____(not, buy) products from endangered species, we _____ (help) them survive.
not buy, will help
doesn't buy, will help
don't buy, will help
If we ____ (not, leave) taps running, we_____ (save) water.
don't leave, will save
don't leave, save
not leave, will save
If we _____(not, leave) all our lights on, we ______ (not, waste) energy.
don't leave, waste
don't leave, won't waste
don't leave, will waste
If he lived near me,
we would see each other.
we will see each other
we wish see each other.
I could join the volleyball team
if I were tall enough.
if I am tall enough.
if I was tall enough.
If this cake didn't have cherries,
Ben will eat it.
Ben would eat it.
Ben wouldn't eat it.
The jet.......in the spacecraft makes it fly very fast.
galaxy
satellite
engine
The recent mission sent a .......into space to improve communication systems.
gravity
orbit
satellite
There are billions of stars in our.....
galaxy
solar system
engine
Someone who studies the start
astronomer
press
scientific
An icy rock travelling through space with a tail of gas
star
comet
planet
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