The teacher and inventor________ from Germany．

He didn’t go to school because of his bad cold.[ ]

I think walking is________ our health.

Who didn’t turn off the light after school yesterday?– It ______ be Lucy. She told me she was the last one to leave the classroom.

Do you know the man ________ visited the United States in February?–Yes. He is Chinese Vice-President Xi Jinping. He said it was his ____ visit to the United States.