There are nearly one hundred foreign students in our university, most of _______ are from America and Australia.
| A．which | B．them | C．whom | D．those |
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 |