----- Mary looks very upset. She _______ failed to pass the exam. ----- I guess so. It's very difficult after all. A must have B could have C should have D might have
Choosing the right dictionary depends on ______ you want to use it for.
It is none of your business ___ ___ other people think about you. Believe yourself.
Why not try your luck downtown, Bob? That’s ______ the best jobs are.
You can only be sure of_________ you have at present; you cannot be sure of something _____ you might get in the future.
Could I speak to__________ is in charge of International Sales ,please?