___________for his expert advice, John is often asked to help others with their personal affairs.
| A．Having known | B．Being known | C．Known | D．Knowing |
Although this ____ sound like a simple task, great care is needed.
| A．must | B．may | C．shall | D．should |
—She looks very happy. She ______ have passed the exam.
—I guess so. It’s not difficult after all.
| A．should | B．could | C．must | D．might |
Thank you for all your hard work last week. I don’t think we ______ it without you.
| A．can manage | B．could have managed |
| C．could manage | D．can have managed |
John, look at the time. ___________ you play the piano at such a late hour?
| A．Must | B．Can | C．May | D．Need |
—May I smoke here ?
—If you ____, choose a seat in the smoking section.
| A．should | B．could | C．may | D．must |