We have come to __________ conclusion that the company has been making __________ great progress these months.
| A．the; / | B．the; a |
| C．a; a | D．/；a |
If it was not an accident, he must have done it _____ .
| A．on purpose | B．in common | C．on occasion | D．in time |
Many students signed up for the ____ race in the sports meeting to be held next week.
| A．800-metre-long | B．800-metres-long | C．800 metre length | D．800 metres length |
____ Knowledge of English is a must in international trade.
| A．the | B．/ | C．A | D．An |
Cloning the sheep ----Dolly is a big ____ in science.
| A．progress | B．run | C．jump | D．rush |
----Who did you spend last weekend with?
---- _________________ .
| A．Palmer’s | B．The Palmers’ | C．The palmers | D．The palmer’s |