---What about ____ passage?
---It's too difficult ____ passage for me．
| A．a, a | B．a, the | C．the, a | D．the, the |
The factory produces half a million pairs of shoes every year, _________ are sold abroad.
| A．80% of them | B．80% of that | C．80% of the shoes | D．80% of which |
China isn't the country _________ she used to be 50 years ago.
| A．that | B．which | C．what | D．since |
Do you have anything is important to tell me?
| A．which | B．that | C．/ | D．it |
20 . They have made_______a rule________in the room.
| A． this; not to smoke | B． it; smoking |
| C． it; to not smoke | D． it; not to smoke |
19. I wondered_____that made him so upset.
| A． how it was | B． which did it | C． what it was | D． who did it |