If our parents do everything for us children, we won’t learn to depend on _________.

The old man wouldn’t stay at home for a rest even if it rained. —- . He would feel sick if he stayed home for one day.

_________, he would have been fired.

hat do you think of genetically modified food (转基因食品)? —We all think ______ is careless ______ some scientists to say it is safe before doing any experiment.

_______ do you exercise in a week?[ ]