Look, your sister is playing the piano over there.－She ______ be my sister. She has gone to America.

I worked on the problem ____ a long time and I worked it out ____ myself ____ last.[ ]

Tom played basketball all the morning. –Yeah, he is a(n)_________boy. He hardly ever feels tired.

Wangpingisnolongerachild.

How pleasant is to go fishing with my father! — Yes. Parents and children should spend more time together.