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They expected us to build the road.

put into passive:

They expected us to build the road.
is the version I think is correct.

What about:
The road was expected to be built by us.

Any suggestions or comments?
Thanks for you help !!
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They expected us to build the road. (active)
We were expected to build the road. (passive)
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Tokyo manufactures this car in Japan.convert in active voice
anonymous Tokyo manufactures this car in Japan.convert in active voice

This is already active. A possible passive version would be "This car is manufactured in Japan by Tokyo". (By the way, did you mean Toyota rather than Tokyo?)