The dancers, all of _______ masks came off suddenly, gave us a great surprise.
| A．their | B．whose | C．which | D．whom |
____ is not everybody ____ can draw so well.
| A．It, all | B．It, that | C．There, who | D．There, that |
It was ____ I met Mr Green in Shanghai.
| A．many years that | B．many years before |
| C．many years ago that | D．many years when |
Mary speaks in a low voice; ____ is difficult to know what she is saying.
| A．it | B．that | C．so | D．she |
Was it because he was ill ____ he asked for leave?
| A．and | B．that | C．that’s | D．so |
It was on October 1st ____ new China was founded.
| A．which | B．when | C．as | D．that |