Nobody knows exactly how many years it will be ____the Chinese football team enters the final stage of the World cup.
A. when B. for C. before d. until
What ______ public is concerned about is whether medical workers and scientists will be able to find_____cure for this new disease in a short time.
| A．不填;不填 | B．不填;the | C．the;不填 | D．the;a |
Having ended the major combat (主战), President Bush_____ rebuilding Iraq.
| A．started out | B．went all out | C．turned to | D．went on |
_____ private cars are bringing us convenience, they may also cause more traffic accidents and pollution.
| A．While | B．As | C．If | D．Since |
_____ I toured Zhang Jiajie, I was deeply impressed with its beautiful scenery.
| A．For the fust time | B．At first |
| C．It was the first time | D．The first time |
After months of voyage, Columbus arrived in_____ later proved a new continent.
| A．where | B．what | C．which | D．that |