—Has John repaired his washing machine?
—He had it________，because he was so busy.
| A．to repaired | B．repair |
| C．repaired | D．to be repairing |
The new headmaster _____ at our party and sang us a song, which greatly added to our joy.
| A．put off | B．set off | C．turned up | D．broke up |
I _____ along the pavement yesterday when some stranger came up and asked me the way to the nearest hospital.
| A．am wandering | B．was wandering |
| C．has wandered | D．had wandered |
Zhang Heng, one of _____ best-known Chinese astronomers, showed a strong interest in _____ astronomy as a child.
| A．the; the | B．the; 不填 | C．不填; the | D．不填; 不填 |
Samuel was _____ why few of his friends attended his birthday party.
| A．spotted | B．crashed | C．puzzled | D．limited |
_____ life exists on any other planet in the solar system still remains a question.
| A．Why | B．Whether | C．How | D．Where |