Donald ___ sixteen tomorrow

Our bodies are strengthened by takingexercise．_______our minds are developed by learning．

With the stress heavier, physicians arealways ______ caution upon citizens in view of heart attack.

He isn’t a teacher and his brother isn’t a teacher, either. —You mean neither he nor his brother . a teacher, right

Talking with my parents is ____difficult for me. They never understand me. — Don’t worry . Nothing is difficult if you try your best.