Mary' s brother has come back home from London, where he __________for three years as a visiting scholar.
A.had stayed B.has stayed C.stays D.stayed
Their ship was blown off course by strong wind, and they arrived in ________is known as Greenland by chance.
A.where B.when C.what D.which
To our great joy, the problem, _________for a number of years, has been settled recently.
A.having discussed B.being discussed C.having been discussed D.to be discussed
If you are trying to _________a new skill, please concentrate on gaining some practical experience.
A.recommend B.assess C.acquire D.convince
—I feel terrible. I didn't do well in the physics test.
—____________. You have already made progress and will surely learn it well.
A.That' s right. B.It is impossible. C.That sounds crazy. D.Don' t take it too hard.
—That important document is nowhere to be seen.
—Don't worry! You ___________ it somewhere. Calm down and think it over.
A.might leave B.might have left C.should leave D.should have left
