In crowded places like_____airports and railway stations,you _______ take care of your luggage.
| A．can | B．may | C．must | D．will |
One summer night in 1990, a reporter appeared at the door of Thomas Edison’s laboratory, _____ for an interview.
| A．asked | B．having asked |
| C．being asked | D．Asking |
--- Is Tom still smoking?
--- No. By next Saturday he _____ for a whole month without smoking
| A．will have gone | B．will have been |
| C．will go | D．has been going |
The traditional goal of science is to discover how things are, not how they ought _____.
| A．to be | B．be | C．have been | D．To |
In their spare time, they will discuss the _____ to the study of English.
| A．means | B．approaches |
| C．methods | D．Ways |
About _____ of the population of that country _____ on farms.
| A．Two third; live | B．Two third; lives |
| C．Two thirds; lives | D．Two thirds; live |