Progress so far has been very good. ______, we are sure that the project will be completed on time.
| A．However | B．Otherwise | C．Therefore | D．Besides |
—Did you see who the driver was?
—No, so quicklythat I couldn’t get a good look at his face．
| A．does the car speed by | B．the car speeds by |
| C．the car speed by | D．did the car speed by |
—Did you meet with the famous star?
—______ I had come here earlier.
| A．Only if | B．If only | C．But for | D．As long as |
Every few years, the coal workerstheir lungs X-rayed to ensure their health.
| A．are having | B．have | C．have had | D．had had |
The plan _________ just because people were unwilling to cooperate (合作).
| A．broke down | B．pulled down | C．turned down | D．put down |
Jack, I’m afraid I’ll turn to you．I think chemistry is _______ physics．
| A．as a difficult subject as | B．a subject the same difficult as |
| C．as difficult a subject as | D．the same difficult subject as |