It was last night ________ I saw the comet.
| A．the time | B．when | C．that | D．which |
_____ puzzles me most is that I don’t know ______ the difference between the two lies.
| A．What, how | B．What, where | C．That, what | D．How, which |
Determination is a kind of basic quality and this is _____ it takes to do jobs well.
| A．why | B．that | C．which | D．what |
_________anyone should want to kill her was unbelievable.
| A．Whether | B．That | C．What | D．Where |
-----Alice looks blue today.
-----Yes, I asked her, but she wouldn’t say _____ troubled her.
| A．why was it that | B．that was why | C．it was what | D．what it was that |
_____ makes his parents proud is _____ his son has been admitted by Beijing University.
| A．That; because | B．That; what | C．What; that | D．What; because |