The four years, from 1860 to 1864 ___ Lincoln spent fighting for freedom of the slaves is the time ___ the American people will never forget.
| A．when; when | B．which ; that | C．when; which | D．which; when |
______everyone can hear the speaker there is no____ of turning up the radio.
| A．Now that; point | B．Even if; point | C．Now that; need | D．Even if; need |
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 |