Okay, I will rewrite the sentences using the opposite adjective.
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A lion is slower than a cheetah.
A cheetah is faster than a lion.
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China is smaller than Russia.
Russia is larger than China.
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Manchester is wetter than London.
London is drier than Manchester.
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January is longer than February.
February is shorter than January.
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Skiing is more dangerous than swimming.
Swimming is safer than skiing.
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Fridays are better than Mondays.
Mondays are worse than Fridays.
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Spain is hotter than the UK.
The UK is colder than Spain.
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Spanish is easier to learn than Japanese.
Japanese is more difficult than Spanish.