The teacher said that Columbus _______America in 1492.
| A．discovered | B．found | C．had discovered | D．had found |
29. ____ time and labour, you should join hands ____ him in the business.
| A．To save; with | B．Saved; with  |
C．Saving; with | D．Having saved; by |
Many students signed up for the _____ race in the sports meeting to be held next week.w
| A．800-meter-long | B．800-meters- long | C．800 meter length | D．800 meters length |
27. Johnson ____ for 5 years for political reasons when he was young.
| A．was put in prison | B．was in the prison | C．got out of prison | D．was in prison |
26. He to paint the whole house but finished only the front.
| A．set about | B．set off | C．set out | D．set in |
25. The form and pictures introduced in the book ________ the content of the article.
| A．throw light at | B．throw light on | C．throw light back | D．throw light off |