It’s really difficult to ______ what he is trying to express.
— I’m sorry to have hurt you.— Forget it. You didn’t mean ________, did you?
My life has been _____ with many milestones and accomplishments of which I am proud.
Although some unexpected difficulties have ________ in the process, we are confident that we can handle them.
As we all know, the problems of environmental pollution facing us today are far from ____.
He presents a new _____ to learning a foreign language, which I think is of great value.