________ 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
