The teacher requested that we ______ the classroom after using it.
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.
Test takers _______ remain in their seats until all the exam papers have been collected.