Unitl tens of years ago, most zoos in such a way—animals in one area and birds in another.
| A．were organized | B．had organized |
| C．will organize | D．have been organized |
–Can you come on Monday? –No, I am_______.
| A．stuck | B．engaged | C．lost | D．puzzled |
Anything _____ could be found has been used to repair the damaged bridge.
| A．which | B．that | C．what | D．不填 |
Here is my classmate _____ bicycle was lost yesterday.
| A．his | B．that | C．whose | D．which |
_____ seemed as if nobody knew anything about the matter.
| A．This | B．That | C．It | D．One |
At the sight of the _____ scene, he was almost _____ to death.
| A．frightened；frightening | B．frightened；frightened |
| C．frightening；frightening | D．frightening；frightened |