Even if there is no scientific proof secondhand smoke causes cancer, there is no reason why nonsmokers should be forced to take this risk.
. Eating too much fat can _______ heart disease and cause high blood pressure.
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.