-City air is very dirty, so it would be wise ___ you wash your hair often. ---I know, but it is not easy ____ me to do that every day. A. for, of B. of, of C. of, for D. for,
The experiment has ______ the possibility of the existence of any life on that planet, but it does not mean there is no life on other planets. A. found out B. pointed out C. ruled
