Whenever he worked until midnight, he        drink some coffee to get refreshed.

(2013·安徽安庆二模)—She looks very happy. She ________ have passed the exam.—I  guess so. It's not difficult after all.

 — Do you know where Mary is? I couldn’t find her anywhere. — Well . She        have gone far—her coat’s still here.

— Who _____ be phoning us at this time of night? — It might be your sister. 

Some aspects of a pilot's job      be boring, and pilots often      work at inconvenient hours．