___ he will come is certain.
This teaching method is being _______ in several schools to help children with disability obtain higher education.
. Can you _____ what he says?
The murder was brought in, with his hands ___ behind his back。
To those scientists, it still remains to be a question ______ man can go back to the old days with time machine.
There is a common belief among them _______ rubbish can and should be put into good use.