The difficulty solving such a problem ten years ago was twice greater than ________ is today.
I can ______ be a teacher. I’m not a very patient person.
When he _______ the door, he found his keys were nowhere.
Most Americans would prefer to keep their problems ______ themselves, and solve their problems ______ themselves.
Every evening after dinner, if notfrom work, I will spend some time walking my dog.
Nine in ten parents said there were significant differences in their approach to educating their children compared with __ of their parents.