Don’t____________to tell us if you have a problem.We’re friends,aren’t we?
--- Is Tom still smoking? --- No. By next Saturday he _____ for a whole month without smoking
The traditional goal of science is to discover how things are, not how they ought _____.
In their spare time, they will discuss the _____ to the study of English.
About _____ of the population of that country _____ on farms.
―Will you go to the Great Wall with us? ―If John wants to go, _______