—Look！He's running so fast!
—Hard to ________ his legs were once broken.
| A．know | B．imagine |
| C．realize | D．find |
It will be a long time ______- he returns.
| A．until | B．before | C．when | D．after |
_________ of us knows how many of them have been killed in that accident.
| A．None | B．No one | C．Not all | D．Not a one |
The natives could live for thousand years in the desert land _______ a foreigner could starve.
| A．on which | B．which | C．in that | D．where |
She sat there without her shoes on, ________.
| A．watching | B．watched | C．looking | D．looked |
______ the windows ______ the pictures of different styles.
| A．Among; hang | B．Between; hanged | C．Among; hanging | D．Between; hang |