Not until all the fish died in the river, ____ how serious the pollution was.
He is writing a letter______ a pen that I have never seen before.
________ the boy didn't take medicine made his mother angry.
I don’t know ________ is in charge of English department.
---Susan is so excited! ---Oh, yes! She is busy preparing for her trip to Africa that she _____ for years.
---Dad, can we move into our new house now? ---No, it _________. The decoration has not been finished yet.