I wonder ____ we can solve this hard problem.
The little boy has not the ______ to lift the heavy box.
I am looking forward to ______ your answer as soon as possible.
—Who______ it be that is knocking at the door? —It ______ be Father, but I’m not sure.
. You can depend on ________ promise he makes.
. Dr. Smith comes from either Yale or Harvard I can’t remember ________.