His ability has never been in doubt----the question is ___________ or not he is prepared to work hard.
| A．that | B．if | C．where | D．whether |
Only when we failed ________ the importance of study.
| A．we realized | B．we had realized | C．did we realize | D．had we realised |
He rushed as fast as he could, ______not to be late for class.
| A．to hope | B．being hoped | C．hope | D．hoping |
city
| A．uncle | B．rescue | C．citizen | D．ocean |
enough
| A．though | B．daughter | C．neighbour | D．laugh |
decade
| A．mineral | B．confidence | C．generation | D．reduce |