这幢楼300米高 用英语怎么说

this building is 300 meters high
the hight of this building is 300 meters

who ranked 21 this exam?

don't worry about having too many homework

it took him 1 and half an hour to take me to the Great Wall
he used 1 and half an hour to take me to the Great Wall

The building is 300 metres tall.
This is a building of 300 meters
Who is the 21th in this exam?
Don't be worried about too much homework.

This building has the height of 300 metres.
Who got the 21st place in this exam?
Don't be worried about the too much homework.

this is a building of 300 meters