The patent officer ______ with my file explained to me that a plant variety is not a/an _______ invention as it is a result of adjusting growth scientifically.
| A．dealing; abrupt | B．dealt; innocent |
| C．deals; practical | D．dealing; valid |
—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 |
—Do you smoke?
—No，I don’t.It’s two years since I __________.
| A．smoked |
| B．have smoked |
| C．has smoked |
| D．don’t smoke |