Scientists say it may be five or six years ______ it is possible to test this medicine on human patients.
| A．before | B．after | C． since | D．when |
There is no doubt _________ our basketball team _________ the game.
| A．that ； would lose | B．if; will lose |
| C．that ； will win | D．whether; has |
The necklace that she lost is very expensive. It's of great _________.
| A．valuable | B．value |
| C．valueless | D．Invaluable |
To my _________，I passed the exam easily.
| A．joy | B．joyful |
| C．joyless | D．Joyfully |
The Great Wall is more than 6000 li in _________.
| A．longer | B．length |
| C．long | D．Longing |
We stood there, _________ at the _________ sight.
| A．frightened ；frightening | B．frightening; frightful |
| C．fright ；frightening | D．frightful ；fright |