——Why doesn't he buy you a drink?——I don't know why, but it isn't _______ he had no money.
Many famous writers are reported ______ long before they started reading themselves.
Every time ______ I see the picture there, I think of my days in a remote mountain village.
Almost all the students were having classes when the earthquake _________.
______ more attention, the tree could have grown better.
Tom, you _____ leave all your clothes on the floor like this!