There is no simple answer, _____ is often the case in science.
| A．as | B．that | C．when | D．where |
---Alice had an accident on her way to school yesterday．
--- ? She is always careful．
| A．How come | B．Why not |
| C．So what | D．What for |
When I met him the other day，it was the first time we ______ each other since we graduated from school.
| A．saw | B．have seen |
| C．were seeing | D．had seen |
The palace caught fire three times in the last century, and little of the original building now.
| A．remains | B．is remained |
| C．is remaining | D．has been remained |
It is the ability you have matters, not where you graduate or what you look like.
| A．which | B．that | C．what | D．it |
—Oh dear! How can you________such important information?
—Forgive me.
| A．leave out | B．carry out |
| C．give out | D．hold out |