Scientists say it will be five or six years ________ it is possible to test this medicine on humans．
| A．after | B．before | C．since | D．When |
—President Bush made a speech in Beijing University yesterday?
-—How did his speech____?
| A．roll over | B．go over | C．turn over | D．think over |
Short skirts ______a few years ago, but they have come back again.
| A．went out | B．came out | C．gave out | D．let out |
Today country music can _____between 200 and 400 million dollars a year.
| A．bring down | B．bring in | C．bring out | D．bring up |
—What do you think of our plan?
—It will certainly ______; it is a great idea.
| A．turn into | B．pay back | C．pay for | D．pay off |
The doctor was _____immediately the little boy fell off a ladder and hurt himself.
| A．asked for | B．sent for | C．waited for | D．cared for |