--They were ________ busy ________ with each other ________ the time. --- How cool the guys are !
Look out! That tree _____ fall down.
He asked me ________ with me.
---Do you mind my turning off the light? ----_____________.Im reading a book.
--- Im afraid I can not return the book to you before Friday ----____________.
When the expression first came into being, people refused to use it but _____ they began to accept it.