—Will you buy the red T-shirt or the black one?—I will buy ______ of them. One is for my brother and the other is for my father.

—        did you stay in Hong Kong?　　 —  About 20 days.

Shanghai is larger than ___________in Jiangsu.

When the father heard from his son from abroad, he became ________.

— ____ will your father be back?— In a week.