I ______ her, but I never could.
| A．ought to help | B．must help | C．must have helped | D．ought to have helped |
Having worked abroad for several years, Janson wanted to settle down to a _________ job in his homeland.
| A．permanent | B．constant | C．primary | D．thorough |
After the captain left, his assistant Roger and other members of the team stayed behind to _____ any misunderstanding, but they refused to hear complaints(抱怨).
| A．approve | B．polish | C．switch | D．clarify |
I just couldn’t believe you should have made such a silly mistake. Look! You have __________ such an important document.
| A．left off | B．left out | C．left alone | D．left aside |
Confucius (孔子) didn’t accept the religious ideas of his times, and was __________ about the supernatural.
| A．cautious | B．admirable | C．skeptical | D．optimistic |
Best of all, with online education, we can stick to our jobs and at the same time study and _______the latest knowledge.
| A．absorb | B．entertain | C．reflect | D．attract |