--What on earth are the police busy with? ---They have been looking into how the plane crash _______.
Hardly had she walked out of the woods ___ she heard the strange scream coming from behind a tree.
___he gave that we should take more exercise in our spare time!
Little Tom is an orphan._____,he has to make a living by himself.
The child tiptoed quietly to the bird.___into the forest when he was about to catch it.
By no means ___ to our plan for the trip.