He ________ the problem ________ in his mind for a whole week before he did anything about it.
I was about to leave my house________the phone rang.
.________they were singing, the teacher came in.
All that can be eaten _______ eaten up.
I can never forget the day _______ we worked together and the day ______ we spent together.
You're the only person ______I've ever met ______could do it.