Once you have become _______ to cigarette smoking or alcohol, it is hard to _______it even though you try hard.
He _______ more visits to his parents.He has been regretting not doing so since they passed away.
Some aspects of a pilot’s job _______ be boring,and pilots often _______ work at inconvenient hours.
English is a language that many people around the world _______ not speak perfectly but at least _______ understand.
Something is wrong with the window; it _______ not open.
—Is there a basketball match between the LA Lakers and Houston Rockets this Saturday?—There _______ be.I’ve already got one ticket.