26.Even if there is no scientific proof yet ______ secondhand smoke causes cancer, there is no reason why nonsmokers should be forced to take this risk.
The little boy insisted that he______ nothing wrong and that he ______.
I think we should ________all the toys to the local children hospital.
Many students believe the choice of their courses and universities should _______their own interest.
The house __________ the capitalist used to live in is now a nursery.
His entire education _______ no more than one year.