In the past,there are -------,-----------,----------,-----------(数亿)people riding bikes to work

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Inthepast,thereare-------,-----------,----------,-----------(数亿)peopleridingbikestoworkInthepast,the

In the past,there are -------,-----------,----------,-----------(数亿)people riding bikes to work
In the past,there are -------,-----------,----------,-----------(数亿)people riding bikes to work

In the past,there are -------,-----------,----------,-----------(数亿)people riding bikes to work
hundreds of millions of

Hundreds of millions of

thousands of hundreds of

hundreds of millions of