It remains __________ whether the medicine will work on the human body.
| A．seen |
| B．to seen |
| C．seeing |
| D．to be seen |
_________ I can see, there is only one way to pass the driving test.
| A．As long as | B．As far as |
| C．Even if | D．Even though |
It's already 10 o'clock and father is _________ to walk in at any moment.
| A．possible | B．likely |
| C．certainly | D．Possibly |
It was not until we came back from outside _________ out of his bed.
| A．did he get | B．when he got |
| C．that he got | D．then he got |
You can go to the library and _________ any information you need for your composition.
| A．look up | B．look back at |
| C．look into | D．look down on |
She heard a terrible noise, _________，of course, brought her heart into her mouth.
| A．it | B．which |
| C．that | D．Whose |