AIDS is said__________the biggest health to people in that area over the past few years.
_______ the news, so far, has been good, there may be bad days ahead.
Not until the train pulled into the next station ________ her suitcase gone.
He hurried to the booking office only ______ that all the tickets had been sold out.
The problem lies_______ we are now giving him a fish, not teaching him to fish.
When ____ comes to saving energy, big changes start with small steps, like turning off the lights.