Having entered the classroom, the teacher ___ the book on the desk.

The experiment　　the discovery of a cure for cancer.

If most breadwinners _______ a day’s pay to the Hope Project, then it will be hopeful.           

Studies show that the things that contribute most to a sense of happiness cannot be bought，______ a good family life，friendship and work satisfaction.

The results of the medical checkup（健康诊断） suggested that my father _____ in poor health, so the doctor suggested that he _____ smoking and take more exercise.