---What on earth are the police busy with? ---They have been looking into how the plane crash _______.
Most of the artists ______ to the party 'were from South Africa.
Do you know the boy _______ under the big tree?
The computer centre, ______ last year is very popular among the students in this school.
Mrs Smith warned her daughter ____ after drinking.
The murder was brought in, with his hands _______ behind his back.