-- _____is that used for?---_____ the floor.
______in health,he insisted on doing the experiment.
Smith was overweight,so the doctor urged that not only_______have less fat and meat,but also he_______.
I failed again in the examination and only then_______how much time I had wasted.
—Why didn’t you say hello to him yesterday?—What a shame!But never before_______I_______him.
—Did you enjoy reading that novel?—Yes, _______such an interesting novel.