This is the last time ____ I shall come here to help you. 　

I admire my English teacher I can remember very few occasions ________ she stopped working because of ill health

The results of the medical checkup suggested that my father ______ in poor health, so the doctor suggested that he ______ smoking and take more exercise.

Our teacher said the earth ________ around the sun.

________my dear teacher couldn’t understand was ________ fewer and fewer middle school students showed interest in her lessons.