A child who lives in an uninteresting environment will develop less intelligence than ______ who lives in a rich and changing environment.

One of the most important questions they had to consider was ______ of public health.

—Don't be angry with your kid when he makes a mistake again, will you?—No, I won 't.  I know  that     of us  are perfect after all.

To some life is pleasure, while to _____ it is suffering. But I don’t know what it is to me.

It was probably at that moment _____ I understood what kindness really was.