Hello!
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You must use pasive voice.
1. Three times as many bicycles as the USA and Japan are made in China.
2. More money are earned in a year by Exxon, a giant oil company in New York, than many countries.
3. Coal was first mined by Romans in the first century AD.
4. About 3,000 flowers a year are grown by the Dutch.
5. Twice as much fuel as an average European is used by an average American.
