If you ..... your rubbish in the bins, the town .... very untidy.
don't throw/ will be
won't throw/ would be
If ice ... , it ... water.
will melt/ will become
melts/ becomes
If we ... electricity, we ...the environment.
will save/ would help
save/ help
If I ..... a bike, I it to school every day.
have/will ride
had/ would ride
If we ..... global warming, we... a big problem in the future.
don't stop/ will have
wouldn't stop/ have
If we all ... our rubbish,our planet .... cleaner.
would recycle/ be
recycled/ would be
If the tempereture rises, the sea ice ... thinner.
will get
gets
got
If I ... you , I would recycle more.
would be
were
am
Unless we stop cutting down trees, many forests .....
will disappear
disappear
would disappear
If you .... the news, you learn a lot of things.
watch
watched
will watch
Unless we ... air pollution, acid rain will get worse.
reduce
don't reduce
will reduce
If he ... all his gadgets when he goes out, he would save energy.
turns off
would turn off
turned off
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