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Using solar energy at home is ... (good) for the environment and also makes your heating bill ... (cheap).
better - cheaper
Reducing the amount of vehicles is a much ... (effective) way to stop pollution.
more effective
The effects of global warming on the planet are becoming ... (serious) each year.
more serious
but it will become ... (cheap) in the future.
cheaper
Unfortunately, Robo-fish is ... (expensive) than other ways of measuring pollution
more expensive
This makes it a much ... (effective) way to fight pollution.
more effective
But Robo-fish is much ... (quick). It detects pollution and swims to its source.
quicker
Water pollution is becoming a ... (serious) problem every year. Scientists used to take water samples to analyze in laboratories.
more serious
It's a lot ... (yellow), too! However, it isn't alive - it's a robot called Robo-fish.
more yellow
There's strange new fish in Spanish waters. At 1.5m, it's ... (long) than the average fish.
longer
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