Taj Mahal / when / build?
When was Taj Mahal built?
languages / speak / how many / in the world?
How many languages are spoken in the world?
in which / tigers / continent / find?
In which continent are tigers found?
make / where / CDs / first ?
Where were CDs first made?
when / 'Romeo and Juliet' / write?
When was 'Romeo and Juliet' wrote?
the Forbidden City / when / build?
When was the Forbidden City built?
what / Guangzhou / call?
What is Guangzhou called?
where / grow / coffee?
Where is coffee grown?
When / first photograph / take?
When was first photograph taken?