Is this school ____ we visited three years ago?

In the dark street, there wasn’t a single person ____ she could turn for help.

Do you work near the building ____ colour is yellow?

Jack is pleased with ____ you have given him and all ____ you have told him.

Nearby were two canoes ____ they had come to the island.

This is the factory ____ we worked a year ago.

This is the school ____ we visited three days ago.

I know only a little about this matter; you may ask ____ knows better than I.

This is the very letter ____came last night.

The foreign guests, ____ were government officials, were warmly welcomed at the airport.