The number 9.11 is a special number, ____, I think, that will be remembered by the Americans forever.
| A．what | B．it | C．which | D．one |
________ 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．anyone | B．someone |
| C．whoever | D．no matter who |
—What upsets him?
—________ his computer is out of order.
| A．Whether | B．What |
| C．That | D．How |