Is _________ 48 hours _________ the man-made satellite _________ is made in our country to orbit the planet around?
Did you find _____ impossible for him to tell the truth?
It isn’t quite _____ that the director will be present at the meeting tomorrow.
The officers narrowly escaped _____ in the hot battle.
The boy is only five years old, but he is quite used _____ the telephone.
--- What happened to your shoes? --- They want _____。 .