When I called you this morning, nobody answered the phone. Where __________?
A survey indicates the _____ of men to women in the population has changed in recent years.
-- Do you think you could manage it?--_____. This is my first time to do it alone.
One-third of the area _____ covered with trees. About seventy percent of the trees _____ been planted recently.
Allow children the space to voice their opinions, _____they are different from your own.
I have _____ my husband again and again not to smoke, but I can’t _____him.