As the twentieth century came to a close, the raw materials for a great national literature were at hand, waiting __________.
| A．to use | B．to be used |
| C．to have used | D．to be using |
You may use the room as you like ___ you clean it up afterwards.
| A．so far as | B．so long as | C．in case | D．even if |
John plays basketball well, ___his favorite sport is badminton.
| A．so | B．or | C．yet | D．for |
Mr.Smith was_________ to be a doctor but he became a teacher when he grew up.
| A．demanded | B．supposed |
| C．suggested | D．agreed\ |
I’m sorry I can’t go to the film with you because I have a lot of things to _________.
| A．take to | B．get to |
| C．see to | D．keep to |
Children’s brains can’t develop properly_______ they lack protein(蛋白质).
| A．when | B．since | C．because | D．unless |