Many scholars and experts from all over the world will be invited to attend this yearly ___ on drug control.
| A．reference | B．intention | C．conference | D．interaction |
34. _________ is known to all is that the earth goes round the sun.
| A．What | B．As | C．It | D．Which |
33. Under good treatment, Linda is beginning to __________ and will soon recover.
| A．turn up | B．bring up | C．pick up | D．pick out |
32. Not until he told me the news __________ the truth.
| A．didn’t I know | B．did I know | C．I didn’t know | D．I knew |
31.. He seldom, __________, goes to the cinema because he is always very busy.
| A．if so | B．if not | C．if any | D．if ever |
30. ---__________you got to know so much about the pop group in America?
---Through the Internet.
| A．How was it | B．What was it | C．How was it that | D．What was it that |