________ some teenagers don't realize is ________ difficult life can be after they get addicted to drugs.
A．What; what a B．That; how
C．What; how D．That; what
_______ didn't attend the lecture yesterday won't be given full marks.
A．Any one B．Whoever
C．Who D．The person
It could be learned from the teacher's eyes ________ he was very satisfied with her performance.
A．that B．whether
C．what D．where
—How will you deal with these papers, Ann?
—I will leave them to ________ takes over the job.
A．anyoneB．someone
C．whoever D．no matter who
—What upsets him?
—________ his computer is out of order.
A．Whether B．What
C．That D．How
Whether ways will be found to stop pullution or not is just ________ worries the public.
A．why B．which
C．that D．what
