--Would you mind giving me advice on how to improve my record?
--If you make _______ most of your potential, there will be ________ rise in your achievement.
| A．不填；不填 | B．the; a |
| C．不填; a | D．the; 不填 |
When you come into the exhibition hall，you can see a large board with a notice on it，saying visitors__________not to touch the exhibits.
| A．will request | B．request |
| C．are requesting | D．are requested |
—Has William finished writing his graduation paper yet?
—I don’t know exactly，but he __________all day.
| A．is writing | B．has been writing |
| C．was writing | D．wrote |
—Would you like to tell me what our teacher said just now?
—She said that light__________faster than sound.
| A．travels |
| B．traveled |
| C．would travel |
| D．was traveling |
—Did you telephone the manager’s office?
—Yes，he__________back before 9 o’clock this morning.
| A．expects | B．is expected | C．expected | D．was expected |
You can certainly leave the classroom as soon as your homework__________.
| A．has done |
| B．has been done |
| C．will be done |
| D．will have been done |