.He is really incompetent! The letter ______ yesterday.a. should be finished typing b. must be finished typingc.must have finished typing d. should have been finished typing
After the heavy snow, many students helped to clear away the snow ______ in our school.
We went through a period_______ communications were very difficult in the countryside.
Professor James will give us a lecture on the Western culture, but when and where _______ yet.
-- I have warned him of the danger but he insisted on going there alone. -- What a _______ boy!
After several months’ voyage, they came to _______ was called the “New World”.