--- __________ did Charles Smith hiccup? --- For about two weeks.
—Jim, do you know the reason _____ Bob kept silent during the discussion?—I guess he was thinking about his sick dog. It might be dying.
We’ll leave for senior high schools soon. It’s really difficult _______ goodbye to our teachers and friends.
—Let’s climb the mountain.—I don’t agree. _______ the mountain will make us exhausted.
—What ______ in your school in the past few years?—A new library and a playground were built last year.
So much homework and so many after-school activities really make the students feel _______. That’s why we should lighten the burden(减负) on students.