I have never been here before as/but/even though/like my friend has
We took a taxi so that/ because/ in short/ in case we were late
I typed the reports before/ despite/ while/ since Joanne interviewed a client

Я так же проставил, но меня очень смущает наличие Past Simple с while

but, because, while..

I have never been here before but my friend has. We took a taxi because we were late. I typed the reports while Joanne interviewed a client. Остальные варианты не подходят по смыслу перевода.