The girl arranged to have piano lessons at the training center with her sister ______ she would stay for an hour.
| A．where | B．which | C．who | D．what |
During the next ten years, she had to work hard _____ for the necklace.
| A．paying | B．to pay | C．for paying | D．in order to paying |
-Would you like to sing a song for us?
-_____.
| A．I prefer not | B．I prefer not to | C．I prefer to not | D．I wouldn't prefer |
It is _____ thinking about it now.
| A．of no use | B．not use | C．no use | D．not of any uses |
You'd better not have the lights _____ all day long.
| A．burning | B．burned | C．to burn | D．being burnt |
_____ the same mistake again made his parents very angry.
| A．His being made | B．He has made | C．He had making | D．His making |