To keep healthy, you should eat any of the food that is offered on the table _______ it is not well cooked.
| A．if | B．until | C．that | D．unless |
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 |
She began to play table tennis_________，and became famous_________ .
| A．in the 1970’s;in her twenties | B．in 1970s;in her twenties |
| C．in the 1970s;in her twenty | D．in the 1970s;in the twenty |