---Look! The telephone is broken. Someone damaged it ________ purpose.
---That may be right. But perhaps it was broken _________ accident.
| A．on; by | B．by; by | C．on; on | D．by; on |
I really don't know _____ I put my wallet．
| A．where was it | B．it was where that |
| C．where was it that． | D．where it was that |
Stephen Hawking has expressed his opinion ___ humans might one day be able to make spaceships capable of such speeds that time on board would slow down．
| A．that | B．whom | C．which | D．what |
A truly creative person is able to _____ with fresh ideas from a story told time after time．
| A．come on | B．come along | C．come up | D．come out |
Not until the next morning _____ how serious the situation was．
| A．did she realise | B．had she realised |
| C．she realised | D．she had realized |
The education reform plan took one year and nine months to draw up, _____ public opinions were called for,
| A．to which | B．during which |
| C．from which | D．from whom |