.At the beginning of class, the noise of desks ____ could be heard outside the classroom.
| A．opened and closed | B．to be opened and closed |
| C．being opened and closed | D．to open and close |
He was very busy yesterday，otherwise he__________to the meeting.
| A．would come | B．came |
| C．would have come | D．had come |
Shortly after the accident，two _________police were sent to the sport to keep order.
| A．dozens of | B．dozens | C．dozen | D．dozen of |
The hero of the story is an artist in his_________ .
| A．thirtieth | B．thirty | C．thirty’s | D．thirties |
The Yellow River is_________river in China.
| A．the second long | B．the second longest |
| C．the two long | D．the two longest |
—What do you think of the book?
—Oh，excellent.It’s well worth _________time.
| A．reading a second | B．reading the second |
| C．to read a second | D．to read the second |