未知题型 This is an _______ that will not be easily forgotten. A.impact B.academic C.insult D.alternative

未知题型 After talking for nearly ten hours， he _______ to the government‘s pressure at last. A.expressed B.yielded C.decreased D.approved

未知题型 Before you mail this letter， you should check again whether you have _______ it or not. A.sunk B.sighed C.sought D.sealed